http://multietch.com/ cheers
--- On Sat, 1/28/12, Steve Dunklee <steve.dunk...@yahoo.com> wrote: > From: Steve Dunklee <steve.dunk...@yahoo.com> > Subject: Re: [meteorite-list] Etching solution > To: mar...@westnet.com, Meteorite-list@meteoritecentral.com, "MexicoDoug" > <mexicod...@aim.com> > Date: Saturday, January 28, 2012, 2:52 AM > hi! cheers! > Steve Dunklee > http://www.sciencelab.com/msds.php?msdsId=9925886 > > > > > > > > > --- On Sat, 1/28/12, MexicoDoug <mexicod...@aim.com> > wrote: > > > From: MexicoDoug <mexicod...@aim.com> > > Subject: Re: [meteorite-list] Etching solution > > To: mar...@westnet.com, > Meteorite-list@meteoritecentral.com > > Date: Saturday, January 28, 2012, 12:46 AM > > Hi Mark, > > > > "Would appreciate a reference for the nickel chloride > being > > 15 times > > more carcinogenic than soluble nickel nitrate." > > > > That's not what I wrote although it could be true I > have no > > such reference to support the above. > > > > What I did write was: > > > > "Only Nickel chloride (a result of ferric chloride > etching) > > is carcinogenic at levels > > 15 times lower than those produced from nitric acid > > etching." > > > > There is a huge difference between what you understood > and > > what I actually wrote as threshhold toxicity levels > don't > > necessarily equate to activity factors. This is > > because the body has dozens of competing homeostatic > > (metabolic, immune/allergic, etc.) processes that > relate to > > detoxification and an imbalance occurs when that one > single > > straw to many put on the camel breaks its back. > > > > The reference should be any MSDS (Material Safety Data > > Sheet), just check whichever one you have access to or > dig > > up first. > > > > Toxicology, especially when it comes to carcinogens is > so > > complex that I don't think anyone understands it, or > they > > would already gotten a billion buck grant from the NIH > by > > now. It just comes in many small pieces. I share > > your opinion that we should reference and I'm sorry if > I > > just dumped all this information for discussion, but it > was > > more useful that keeping i to myself. I've not found > a > > reasonable layman's treatise anywhere on the subject so > I > > figured the met list was as good as it gets without > opening > > yet another research project to compete with the other > ones > > I've got floundering. > > > > Anyway, the exposure limits I mention I believe are for > lab > > rats approximating other mammals, like humans. > Again, > > the more you get into this the more it's hard to > muzzle > > oneself becasue now we're getting further into it: > > > > so - must ask, can you breath it in (probably not in > most > > cases, but definiely cover your mouth, eyes, and any > other > > open oriface such as a wound when doing this. That > > should be 'common knowledge' but really if doing it for > the > > first time, maybe not. > > > > and - must ask, so how permeable is the skin to it ... > > becasue if one has a 15X lower threshhold but is 15x > more > > difficult to uptake, then we'd have a wash. Then > there > > are solubility issues, but these both look like they > are > > well soluble, just a glance at the MSDS will answer > that. > > > > last here, but definitely not any closure, is; what's > the > > significance of getting these things into ones local > > envoironment and the general environment (waters, > soils, > > air, etc.). We don't think about this but doing it > out > > on the concrete patio outside of the kitchen and > tossing the > > waste into the immediate area, it will dry and become > > particulate contaminants which over time the wind will > > distribute in the lungs of little boys playing there, > > through the kitchen window, etc. Probably no big > deal > > in most cases, but there is always that one case that > > something goes terribly wrong. And getting back to > the > > maximum 'permissible' exposure limit (sheesh, now to > add > > residence time, cumulative properties in the body, it's > head > > spinning). > > > > Which is why, in this case for a rat which is assumed > to > > react as a human (but may not), at least we can point > a > > finger at the threshold of toxicity, which itself is a > a > > single point determined after half of the subjects > have > > croaked, illustrating that half are just fine whereas > it is > > toxic to half of them at even lower levels, or > something > > along tose lines. > > > > As for your other reference of isopropyl vs. ethyl > alcohols > > and explosion hazards, I'm sorry but perhaps someone > else > > has more time to develop this properly vs. this > informal > > discussion forum. If I had time and a full lab, I > > would start by maing a ternary diagram of the two > alcohols > > and nitric acid, and plot the flash point of the > mixture for > > starters. The information I saw was anecdotal and > not > > rigorous nor very quantitative. However I don't > hacve > > time to spend on this subject any more due to personal > > circumstances and recommend that you try googling. > > This is not a case of a proving beyond a reasonable > doubt > > that it is more explosive. However there are enough > > warnings out there thaty would seem to suggest more > violent > > and higher incidence of isopropanol-HNO3 mixtures than > the > > EtOH analog, since we are talking about personal > > safety. Clearly Isopropyl alcohol is similar > > inproperties relating to etching that given the more > > widespread use in general metallurgy of EtOH, it's the > devil > > we know better > > > > I'm convinced of the Isopropanol/ethanol issue all I > need to > > be more vigilant. But that doesn't mean I wouldn't > use > > it if there was some reason to do that. Rather than > > obsessing too much over a terribly complex issue and > coming > > to the same inconclusion, I'd just make simple, yet > > effective modifications to my procedure - > > Why deal with comncentrated nitric in a home > environment at > > all? How silly! You (general) want to save a few > > pennies at your own risk, pennywise --- just have the > > Hazardous Materials emergency number handy. > Otherwise > > buy the diluted acid= problem significantly > minimized. > > You want to make etchant? Don't make such a large > > amount in a bottle/beaker at once. Don't use such an > > excess when etching, experiment by painting it on with > a > > brush instead - problem significantly minimuzed ... and > so > > on. > > > > Hope this gives better insight. Having THE answer to > > these things is too tall an order, yet experience and > common > > sense are why other individuals can etch more easily > than > > making scrambled eggs. Our appreciation of risk is > > terribly distorted. Once I was in a discussion with > > Sterling sopmewhere discussing this and he even > referenced > > someplace, proabbly wiki the bias I described had a > > name. You know, the same one that evaluates whether > to > > be frightened from falling asteroids vs. driving to > work in > > the morning. I'm still waiting for the thriller > movie, > > "Highway jaunt" where no rogue asteroids or murderous > > psychopats pass by, but Strawberry Shortcake girl just > takes > > her car for a spin and suddenly every individual in > the > > traffic stream has a compulsion to run over her on her > sweet > > bicycle. Point of the dumb example being the high > risk > > we have experience has much lower fear factor than the > > almost non-existent risk which ends in carnage and > mahem, > > even if a decision tree analysis shows that the > friendly > > risk is a million times more likely. > > > > Kindest wsihes > > Doug > > > > PS I have stretched too much to participate in this > give > > some other difficult responsibilities I ahve at the > m,oment > > so I did my best and will likely retire for a while to > catch > > up on things. > > > > PPS, After all this, I think my new etchant of choice > will > > be Coca Cola. No doubt it works or can be tweaked > to, > > too. > > > > > > > > -----Original Message----- > > From: Mark Grossman <mar...@westnet.com> > > To: nf114ec <nf11...@npgcable.com>; > > meteorite-list <meteorite-list@meteoritecentral.com>; > > MexicoDoug <mexicod...@aim.com> > > Sent: Fri, Jan 27, 2012 6:20 pm > > Subject: Re: [meteorite-list] Etching solution > > > > > > Hi, > > > > Couple of thoughts. > > > > Mark's Law: > > > > If you're standing in the exact same spot as someone > else > > when a mixture of > > nitric acid and ethanol explodes, the sensitivities of > the > > two individuals > > to harm are always the same. :-) > > > > Both nickel chloride and nickel nitrate are soluble > nickel > > compounds, and as > > far as carcinogenicity goes, the American Conference > of > > Governmental > > Industrial Hygienists and the International Agency for > > Research on Cancer > > group the two compounds together. As far as I am > > aware, there was no > > singling out of nickel chloride as being 15 times more > > carcinogenic than > > nickel nitrate - you indicated both are products of > etching > > - one from > > ferric chloride and the other from nitric acid. The > > insoluble oxides of > > nickel are more carcinogenic, but that's not the > compounds > > you are referring > > to. Would appreciate a reference for the nickel > > chloride being 15 times > > more carcinogenic than soluble nickel nitrate. > > > > Similarly, would appreciate a reference to isopropyl > alcohol > > being more > > dangerous to use for etching with nitric acid than > ethanol, > > under the same > > set of conditions. Why is isopropyl alcohol more > prone > > to a "freak" > > explosion or "blow up" than ethanol? Explosions with > > concentrated nitric > > acid and ethanol are well-documented. > > > > Now I am not relying on Wikipedia as an academic > reference, > > but I think the > > information contained on the webpage is worthy of > discussion > > and/or > > criticism. See http://en.wikipedia.org/wiki/Nital and the mention of > > the > > hazards associated with 5 and 10 percent solutions. > > This information > > appears to come from Bretherick, which is a pretty > good > > chemical reference > > that I have used in the past (see > > http://www.ab.ust.hk/hseo/tips/ls/ls005.htm). > > > > Reading Material Safety Data Sheets should always be > > required - but realize > > that many are inadequate and often do not list or spell > out > > the safety > > precautions which should be employed. > > > > A lot of technical information was contained in the > last few > > emails, and if > > we all agree that respect for chemicals is critical, > then it > > would be useful > > to confirm the facts. > > > > Thanks! > > > > Mark > > > > Mark Grossman > > Meteorite Manuscripts > > > > > > ----- Original Message ----- > > From: "MexicoDoug" <mexicod...@aim.com> > > To: <nf11...@npgcable.com>; > > <meteorite-list@meteoritecentral.com> > > Sent: Friday, January 27, 2012 1:02 PM > > Subject: Re: [meteorite-list] Etching solution > > > > > > > Hi Jim, > > > > > > My respects to all the ferric chloride lovers out > there > > and > > especially Ron > > > Hartman, bless him. A blanket statement of a > > "better etch" is pretty > > > meaningless. I recall asking Arcady who had all > > the Seymchan several > > > years back why all of his specimens were etched > so > > deeply that they > > looked > > > like someone chiseled the etch into them and then > put > > on a matte > > > clearcoat. He said, the customers prefer a deep > > etch. I thought it > > was > > > butt ugly (not to mention a more discrete etching > such > > as by mild > > nitric > > > acid's slow action introduces far less nucleation > sites > > for > > oxidation). > > > There are so many factors. > > > > > > If the iron chloride etch were better it wouldn't > hurt > > to send those > > > conclusions to the Smithsonian, British Museum, > Weiner > > > > Naturhistorisches > > > Museum, Max-Planck-Institut für Chemie (or > whatever > > its called now) > > > Collection, Paris Muséum National d'Histoire > > Naturelle, etc. for > > comment. > > > ;-) > > > > > > BTW, there are many variables not realated to the > etch > > to consider. > > > Though ferric chloride is 'easier', when it comes > to > > mixing up, it > > doesn't > > > mean it is less toxic in other ways. Ever > wonder > > if it was legal or > > smart > > > to pour spent solution down the drain or into the > > soils? Nickel > > chloride > > > and nickel nitrate (produced in etching) are both > > mutagenic. Only > > Nickel > > > chloride (a result of ferric chloride etching) is > > carcinogenic at > > levels > > > 15 times lower than those produced from nitric > acid > > etching. But > > with all > > > the other heavy metal ions in iron meteorites, > again, > > respect for the > > > chemical is important regardless of what risks > are > > perceived - it's > > never > > > the full story and like smoking, everyone doesn't > even > > have equal > > > sensitivity. > > > > > > Kindest wishes > > > Douh > > > > > > > > > -----Original Message----- > > > From: Jim Wooddell <nf11...@npgcable.com> > > > To: Meteorite-List <meteorite-list@meteoritecentral.com> > > > Sent: Fri, Jan 27, 2012 6:48 am > > > Subject: Re: [meteorite-list] Etching solution > > > > > > > > > I believe there was an article by Hartman a few > years > > back about the > > use > > > of > > > ferric chloride. The conclusion was that it > gave > > a better etch??? I > > > think > > > it was in Meteorite-Times. > > > > > > Jim > > > > > > > > > > > > Jim Wooddell > > > http://k7wfr > > > > > > ----- Original Message ----- > > > From: "MexicoDoug" <mexicod...@aim.com> > > > To: <mexicod...@aim.com>; > > <mar...@westnet.com>; > > > <meteoritesno...@hotmail.ca>; > > <meteorite-list@meteoritecentral.com> > > > Sent: Friday, January 27, 2012 1:49 AM > > > Subject: Re: [meteorite-list] Etching solution > > > > > > > > >> "Besides water, I'm suspecting Nitric + > acetone > > (Nitkeytone ?) and > > > any > > >> number of other solvents would work" > > >> > > >> OK, don'rt bother with this one! I just > did; > > It actually etches, but > > >> leaves a yucky finish. The fumes are no > worse > > than other nitals, > > > though I > > >> wouldn't want to breath much of them until I > knew > > more; but there > > > didn't > > >> seem to be any decomposition. I used > reagent > > grade acetone to avoid > > >> possibly nasty impurities, and the nitric > acid > > concentration only > > > 3.9% > > >> just in case I hit a flash point, full face > shield > > and a fan venting > > > right > > >> out the door. Nice to have had an 81 F day > > today and still its warm > > >> enough to open the door ;-) nice etch, > terrible > > residue. > > >> > > >> Kindest wishes > > >> Doug > > >> > > >> > > >> > > >> -----Original Message----- > > >> From: MexicoDoug <mexicod...@aim.com> > > >> To: markig <mar...@westnet.com>; > > meteoritesnorth > > >> <meteoritesno...@hotmail.ca>; > > meteorite-list > > >> <meteorite-list@meteoritecentral.com> > > >> Sent: Fri, Jan 27, 2012 3:11 am > > >> Subject: Re: [meteorite-list] Etching > solution > > >> > > >> > > >> "explosive" > > >> > > >> Definitely caution when playing around with > > corrosives is of the > > first > > >> order...that said, > > >> > > >> sure, ethanol is a racing car engine fuel and > under > > the right > > >> conditions can combust; But people drink it > even > > straight... > > >> > > >> Many things we do have risks associated with > them > > some very serious > > > and > > >> definitely we must respect all reagents > especially > > corrosives like > > >> nitric acid. For example, many people enjoy > > fireworks. Yet, > > > fireworks > > >> are explosive and dangerous if you put them > near > > sparks or heat,or > > try > > >> to light them with a charcoal grill. And > > obviously gasoline combusts > > >> too yet mechanics and Dads everywhere use it > to > > clean hands and metal > > >> parts and also have arc welders nearby. Or > > sulfuric acid inside a > > car > > >> battery - don't get it on your bikini when > working > > on the car! If > > you > > >> are going to use anything, it needs to be done > with > > respect and a > > > quick > > >> read of the MSDS of whatever chemicals you > are > > using... (and don't > > >> trust everything you read on a discussion > l;ist > > posted at 3 AM) > > >> > > >> It is not a good idea to have concentrated > nitric > > acid and ignore the > > >> label, for example and my heart goes out to > Anita > > on that. Depends > > > the > > >> kind of person you are. When I make my > > smoothie in the morning I use > > >> fresh cherries as one of 18-20 ingredients and > a > > preparation that > > > takes > > >> an hour. It's life threatening if I > > accidentally put a pit in my > > >> blender (which can easily liquify meteorites, > it's > > so powerful) due > > to > > >> the specialized needs of a family member who > cannot > > eat. So I double > > >> count the cherries first, count the pits as I > punch > > them out, and > > then > > >> count them once again when I dispose of > them. > > No shortcuts, All > > > common > > >> sense! > > >> > > >> Bart Simpson's pet python once made nital in > an > > episode of The > > >> Simpsons, which is amusing if you haven't had > a bad > > experience you > > >> can't laugh about.... I think the writers > were > > Caltech rejects that > > > had > > >> to go to MIT and have to do this to humor > > themselves, this wasn't the > > >> only snarky chemistry episode. > > >> > > >> (episode: Stop or my Dog will Shoot!) > > >> > > >> Here's the link: > > >> > > >> http://video.i.ua/user/810302/8185/35583/ > > >> > > >> it take a little time to stream, but once > ready the > > scene is at the > > >> 17:49 minute:seconds mark. > > >> > > >> ... and that' why in my summary which I did > much > > too quickly to be > > >> complete, I suggest that you use water, that > is to > > say, NitH20,. or > > as > > >> it's commonly known just dilute Nitric Acid, > rather > > tha alcohols to > > >> develop your method. Nothing wrong with > > water, it is really getting > > a > > >> bum wrap and it is GRAS ;-) It is what > > everyone that is using FeCl3 > > > is > > >> using as a diluent, too. For the HNO3 the > 3.0 > > N concentration works > > >> best for me. Absolutely no need to buy > > concentrated acid and you can > > >> avoid all the issues of what to add to what > and no > > need for Hazmet > > >> backup. You can buy it already diluted, get > > the same benefit of a > > >> nitric acid etch (alcohol doesn't etch, it's > only a > > carrier and > > >> diluent). Just crank up the oven to the > > higher end of a safe drying > > >> temperature. That's the only real benefit > of > > alcohol in my opinion - > > >> it allows a cooler drying which can povide a > nicer > > (lower oxdation > > >> residue on the virgin etched surface, but now > we > > are staerting rally > > > to > > >> split hairs...IMO. > > >> > > >> Speaking of diluents, there's no reason nital > > (alcohol) is special as > > > a > > >> diluent. Besides water, I'm suspecting > Nitric > > + acetone (Nitkeytone > > > ?) > > >> and any number of other solvents would work > fine if > > not be hiding a > > >> secret for even a better etching solution. > > Sure acetone is flammable > > >> and can give you the willies too, you can't > win but > > that doesn't stop > > >> women who understand the chemical they use > from > > putting it on their > > >> fingernails ;-) granted not with acid, though > I bet > > some do > > >> inadvertantly mix it with salycilic acid > solution > > when disolving > > > excess > > >> skin ;-), which if not used properly could > > chemically remove a lot of > > >> flesh ... > > >> Kindest wishes > > >> Doug > > >> > > >> > > >> -----Original Message----- > > >> From: Mark Grossman <mar...@westnet.com> > > >> To: MexicoDoug <mexicod...@aim.com>; > > meteoritesnorth > > >> <meteoritesno...@hotmail.ca>; > > meteorite-list > > >> <meteorite-list@meteoritecentral.com> > > >> Sent: Fri, Jan 27, 2012 12:32 am > > >> Subject: Fw: [meteorite-list] Etching > solution > > >> > > >> > > >> Did a quick search on the internet. Read > this > > tale from the > > Meteorite > > >> Association of Georgia regarding the hazards > of > > mixing nitric acid > > and > > >> ethanol: > > >> http://www.meteoriteassociationofgeorgia.org/article-052007.htm. > > >> > > >> Mark > > >> > > >> Mark Grossman > > >> Meteorite Manuscripts > > >> > > >> > > >> ----- Original Message ----- > > >> From: "Mark Grossman" <mar...@westnet.com> > > >> To: <mexicod...@aim.com>; > > <meteoritesno...@hotmail.ca>; > > >> <Meteorite-list@meteoritecentral.com> > > >> Sent: Thursday, January 26, 2012 11:40 PM > > >> Subject: Re: [meteorite-list] Etching > solution > > >> > > >> > > >>> I don't know all of the details of the > etching > > process, but a word of > > >>> caution - mixing concentrated nitric acid > with > > ethanol can result in > > >> an > > >>> explosion and a fire. I've witnessed > the > > results of the reaction > > when > > >>> someone inadvertently mixed the two in a > lab > > years ago. > > >>> > > >>> Mark > > >>> > > >>> Mark Grossman > > >>> Meteorite Manuscripts > > >>> > > >>> ----- Original Message ----- > > >>> From: "MexicoDoug" <mexicod...@aim.com> > > >>> To: <mexicod...@aim.com>; > > <meteoritesno...@hotmail.ca>; > > >>> <Meteorite-list@meteoritecentral.com> > > >>> Sent: Thursday, January 26, 2012 11:23 PM > > >>> Subject: Re: [meteorite-list] Etching > solution > > >>> > > >>> > > >>>> PS - if you don't have a hood or > other > > exhaust, the methyl alcohol > > >> could > > >>>> also be dangerous becasue the liver > breaks > > it down into toxins and > > >> you > > >>>> will inhale some of it. That's > > another reason why I use ethanol in > > >> the > > >>>> oven, and frankly much more important > a > > reason than saving a few > > >> pennies > > >>>> ;-) You can consider the residence > > time of the toxins in your > > >> system to > > >>>> be as long as a week, so if your are > doing > > etxching all day > > long,and > > >> are > > >>>> using methanol nital you definitely > need a > > very well ventilated > > >> place, > > >>>> and methanol is sneaky worthy of a > CSI > > episode of an innocent who > > >> done it > > >>>> since the syptoms and critical second > hit > > can be stealth and barely > > >>>> naseaous for the first. > > >>>> > > >>>> I know you didn't ask about methyl > alcohol, > > but its good to see the > > >> 4 > > >>>> common solcvent benefits/liabilities > side > > by side, at least my take > > >> on > > >>>> it. Anyway, you can see why ethyl > alcohol > > iis usually preferred. I > > >> just > > >>>> checkethe azeotrophes andisopropyl is > only > > 2.3 C above ethanol > > >> mixtures > > >>>> so its ability to remove water would > be > > very similar in the oven, > > >> the > > >>>> last thing to look up to decide > > theoretically approximating the > > >>>> penetrating ability as related to the > > surface tension of the > > alcohol > > >>>> (just a guess) what is the bestest > alcohol > > would be to check the > > >> surface > > >>>> tension. I just did and all three > > alcohols are nearly 4 times that > > >> of > > >>>> water and within 5% o each other, so > I > > would think that on > > >> penetrating > > >>>> ability they are probably all tied > and > > would argue all factors > > >> considered > > >>>> ethanol is best since the worst you > get is > > a standard hangover in > > >>>> standard use conditions, and to get a > freak > > explosion from EtOH > > >> mixtures > > >>>> with acid is minimal compared to > > isopropyl. > > >>>> > > >>>> Ferric chloride of course doesn't have > the > > toxicity not > > >> flammability, but > > >>>> it stains like heck and with proper > respect > > for the reagents plus a > > >>>> little experience, like everything > else the > > risks are minimized. > > >> That's > > >>>> another reason to start with dilute > nitric > > which I highly recommend > > >> until > > >>>> you have the bugs worked out of the > etching > > "assembly line", ie, > > >> method > > >>>> you find best for your work. > > >>>> > > >>>> Good luck, > > >>>> > > >>>> Kindest wshes > > >>>> Doug. > > >>>> > > >>>> > > >>>> -----Original Message----- > > >>>> From: MexicoDoug <mexicod...@aim.com> > > >>>> To: meteoritesnorth <meteoritesno...@hotmail.ca>; > > Meteorite-list > > >>>> <Meteorite-list@meteoritecentral.com> > > >>>> Sent: Thu, Jan 26, 2012 10:30 pm > > >>>> Subject: Re: [meteorite-list] Etching > > solution > > >>>> > > >>>> > > >>>> Craig, > > >>>> Let me add (the message actually got > away > > before being finished as > > I > > >>>> write piecemeal and then send) that as > far > > as etching it works > > fine, > > >>>> but if you look at the series of > alcohols, > > methyl (bp = 65 C), > > ethyl > > >>>> (bp = 78 C) and isoproply alcohol (bp > = 83 > > C), methyl alcohol > > >>>> (methanol) is by far the safest until > you > > get a lot of experience > > >>>> working with these under a hood. > > "Ethyl nital" is mildly flammable > > >> in > > >>>> and Isopropyl nital is pretty > dangerous > > since if can blow up in > > >> certain > > >>>> conditions that aren't difficult to > > arrange. Nothing to do with > > the > > >>>> etching results which are left to > trial and > > error, but rather the > > >>>> safety which I should have mentioned. > > >>>> > > >>>> While all the alcohols work fine, keep > in > > mind two of the factors > > > you > > >>>> are working with are > miscibility/penetrant > > ability and vapor > > >> pressure. > > >>>> Vapor pressure you can estimate by > boiling > > point - lower bp is a > > >> higher > > >>>> vp. The higher vp the quicker it > will > > evaporate out, so methanol > > >> would > > >>>> seem to have the advantage, thought > it > > might form some azeotropes > > > and > > >>>> stay in longer, as could the rest > without > > looking this up (no time > > > at > > >>>> the moment). > > >>>> > > >>>> To the series of three common alcohols > you > > could just add water bp > > = > > >>>> 100 and consider it almost as a > continuim > > and play with the you > > like > > >>>> which will influence drying time > among > > other important parameters. > > > I > > >>>> use methanol and later rinse with > ethanol > > (cheaper for me), which > > is > > >>>> the reverse of good drying practice I > would > > think, but half of the > > >> time > > >>>> I just use the diluted acid at 2 - 3 > N. > > >>>> > > >>>> Hope that was a better answer, sorry > for > > not finishing the first > > >>>> kindest wishes > > >>>> Doug > > >>>> > > >>>> > > >>>> -----Original Message----- > > >>>> From: Craig Moody <meteoritesno...@hotmail.ca> > > >>>> To: mexicodoug <mexicod...@aim.com> > > >>>> Sent: Thu, Jan 26, 2012 9:42 pm > > >>>> Subject: RE: [meteorite-list] Etching > > solution > > >>>> > > >>>> > > >>>> Much appreciated Doug, Thank you! I > > have lots of 99% around. > > >>>> > > >>>> Craig > > >>>> > > ______________________________________________ > > >>>> > > >>>> Visit the Archives at > > >>>> http://www.meteoritecentral.com/mailing-list-archives.html > > >>>> Meteorite-list mailing list > > >>>> Meteorite-list@meteoritecentral.com > > >>>> http://six.pairlist.net/mailman/listinfo/meteorite-list > > >>>> > > >>>> > > ______________________________________________ > > >>>> > > >>>> Visit the Archives at > > >>>> http://www.meteoritecentral.com/mailing-list-archives.html > > >>>> Meteorite-list mailing list > > >>>> Meteorite-list@meteoritecentral.com > > >>>> http://six.pairlist.net/mailman/listinfo/meteorite-list > > >>> > > >>> > ______________________________________________ > > >>> > > >>> Visit the Archives at > > >>> http://www.meteoritecentral.com/mailing-list-archives.html > > >>> Meteorite-list mailing list > > >>> Meteorite-list@meteoritecentral.com > > >>> http://six.pairlist.net/mailman/listinfo/meteorite-list > > >> > > >> > > >> > ______________________________________________ > > >> > > >> Visit the Archives at > > >> http://www.meteoritecentral.com/mailing-list-archives.html > > >> Meteorite-list mailing list > > >> Meteorite-list@meteoritecentral.com > > >> http://six.pairlist.net/mailman/listinfo/meteorite-list > > >> > > >> > ______________________________________________ > > >> > > >> Visit the Archives at > > >> http://www.meteoritecentral.com/mailing-list-archives.html > > >> Meteorite-list mailing list > > >> Meteorite-list@meteoritecentral.com > > >> http://six.pairlist.net/mailman/listinfo/meteorite-list > > > > > > ______________________________________________ > > > > > > Visit the Archives at > > > http://www.meteoritecentral.com/mailing-list-archives.html > > > Meteorite-list mailing list > > > Meteorite-list@meteoritecentral.com > > > http://six.pairlist.net/mailman/listinfo/meteorite-list > > > > > > ______________________________________________ > > > > > > Visit the Archives at > > > http://www.meteoritecentral.com/mailing-list-archives.html > > > Meteorite-list mailing list > > > Meteorite-list@meteoritecentral.com > > > http://six.pairlist.net/mailman/listinfo/meteorite-list > > > > > > > > > ______________________________________________ > > > > Visit the Archives at > > http://www.meteoritecentral.com/mailing-list-archives.html > > Meteorite-list mailing list > > Meteorite-list@meteoritecentral.com > > http://six.pairlist.net/mailman/listinfo/meteorite-list > > > ______________________________________________ > > Visit the Archives at > http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
