[pinhole-discussion] Ag2O stability
Mike Ware's argyrotytpe process uses either silver oxide + sulfamic acid (a tile grout cleaner) or Ag2NO3 + lye to make Ag2O. I think you dissolve the silver oxide crystals hot (50-60 C) water and are warned it is rather effervescent, so there is a way to get the silver oxide off something, but I guess it defeats the purpose of removing from a solution to put it back into another. I think despite this claim to stability it's still considered an aggressive compound in it's pure form (I forget if it's classified as an oxidizer or just 'corrosive'). G. Smyth would know better than me...I'm just spewing stuff I read elsewhereIm kind of spooked by most of the chemicals, but I have this crude rule of thumb that if it's inorganic chemistry it's less evil than organic chemistry as far as health goes (does not apply to organic fools oops I mean foods :O) Murray
Fwd: Re: [pinhole-discussion] Nearly Off Topic
hi Ingo, thats great michel bayard 71 -5 th. ave. brooklyn, new york u.s.a. 11217 a happy life is made up of many happy moments ---BeginMessage--- Hi mickey, that's a very good idea. My adress is Ingo Guenther, Neisser Str. 7, D-26127 Oldenburg, Germany. I am glad to send the postcard, please give me your adress. You can also posted it to my Email adress ingoguent...@web.de regards ingo - Original Message - From: mickey michelbay...@webtv.net To: pinhole-discussion@p at ??? Sent: Sunday, February 03, 2002 1:42 AM Subject: Re: [pinhole-discussion] Nearly Off Topic hi brother..i also work with film canisters and would like to trade a postcard with you. Oh, btw. why dont we have a film canister postcard swap..regards mickey a happy life is made up of many happy moments ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ---End Message---
Re: [pinhole-discussion] small toilet darkroom
don't know if there is a website...I just have a copy of his book...r.
SV: [pinhole-discussion] Pinholing with SLR and extension tubes
Guillermo, When I read your message it came to my mind that there are plastic caps used as covers, say for water pipes. Probably cheap and available in a good number of dimensions. Quite easy to sand before being pinholed also, which should be an advantage, since I believe that a thin pinhole cap makes more sharp pictures. I have avoided 35 mm film just because of that it has to be enlarged a good number of times. However, there are some motives with a few elements of substantial size and interesting shapes and/or colors that could turn out right. I shall give it a try (when I find the time). Dennis From: G.Penate pen...@rogers.com To: pinhole-discussion@p at ??? Sent: Saturday, February 02, 2002 3:43 PM Subject: Re: [pinhole-discussion] Pinholing with SLR and extension tubes - Original Message - From: Dennis Johanson dennis.johan...@telia.com This week I got an old SLR back from service, and I have a set of extension tubes for it. An idea came to my mind, namely to use one or more of the extension tubes with a pinholed lens cap or aluminum foil at front. Probably someone has tried this already, and if so I would be very interested in learning the outcome of it as well as in getting some suggestions for improving my idea. Dennis, You are right, it has been tried before. Some people lacking ext.tubes have even used toilet paper inner cardboard rolls (or similar rolls) or PVC/ABS tubes. Ext.tubes are really convenient as you can use a lens cap, as you mentioned. Your idea is OK, IMO. As for the outcome, it'd depend on what you are looking for. Resolution on film won't be as good and enlarging the frame willl make it worst (or better if that is what you are after). The best way is to try it out myself, but hey, I am the guy presently converting a (too small) guest toilet into a darkroom, So many things to do, so little time, I know what you mean. Guillermo ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
SV: [pinhole-discussion] Pinholing with SLR and extension tubes
Thank you for your reply, Howard. Lens shade - that was exactly the sort of idea that I was looking for. Since English, not even American English, isn't my mother tongue (but it was my father's BTW) I just want to check with you that foamcore is what I think, namely plastic foam in the middle covered by thin cardboard on each side. If so, will you get sharp pictures in spite of the thickness of the foam, which I estimate to be about 0,5 cm or 1/4 - 1/8? Dennis - Original Message - From: Howard Wells sandw...@earthlink.net To: pinhole-discussion@p at ??? Sent: Saturday, February 02, 2002 3:38 PM Subject: Re: [pinhole-discussion] Pinholing with SLR and extension tubes Works fine for me. I use black foamcore cut into circles for the pinhole holder. Mostly I use this technique with zoneplates and put an additional tube on the front as a lens shade. this also allows for easy comparison testing of different size pinholes. I use old Leica threadmount tubes on my old leica, they are inexpensive and seem to come in a good range of sizes. One could also use the black plastic plumbing pipe or cardboard mailing tubes. Howard Wells Dennis Johanson wrote: This week I got an old SLR back from service, and I have a set of extension tubes for it. An idea came to my mind, namely to use one or more of the extension tubes with a pinholed lens cap or aluminum foil at front. I could even get a second extension tube set and use these ones separately as front tubes with permanent holes of different diameters that would fit different combinations of the other tube set. Probably someone has tried this already, and if so I would be very interested in learning the outcome of it as well as in getting some suggestions for improving my idea. The best way is to try it out myself, but hey, I am the guy presently converting a (too small) guest toilet into a darkroom, and that keeps me busy enough for the moment. Dennis ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
Re: [pinhole-discussion] Disposing of chemicals
I have a good background in this topic... managed a silver recovery collective, wrote a newsletter called 'Photography the Environment', did some original research into breaking down photo chemicals with bacterial formulations, consulted for lots of schools labs, etc. The hard part is that it takes a long time to tell the story and I do not believe it is necessary to become an alarmist. So, here are a few tips that are easy to implement... 1. If you have a municipal waste system there is usually nothing to be worried about regarding disposal because the silver in the fixer is removed at the waste treatment plant. However, the silver level is sometimes regulated. Call and ask for the regulation but do not tell them you have a darkroom, because there are many ignorant enforcers out there who can't wait to shut you down. We can then design a method of meeting the regulation, which will make them very happy instead. 2. The silver in photo chemicals is relatively very stable and poses no problem when disposed of in SMALL AMOUNTS, but it's regulated using the same laws that govern electroplating other large industrial operations dumping unstable forms of ionic silver. This is because the lawmakers cannot find a way to make an exception for small users. 3. Home septic systems can be used with some precaution in order to keep their bacteria alive. Here's a simple method to help save the life of your septic tank: a) pre-oxidize solutions before you flush them down the drain by letting them stand in trays in the open air (if the solution is 1 up to inch deep, 12 hours is sufficient)... this way the solutions break down to simpler forms before you dispose b) add small amounts to the system slowly along with lots of water c) do not mix developer fixer directly because ammonia gas will form d) if you want to remove silver from the fixer place one pad of steel wool in a gallon of fixer and leave it in there for 24 - 48 hours for complete silver removal (0 - 2 ppm level)... the solution can then be discarded and the collected silver can be dried and saved or put in the solid waste for disposal 4) the same principles work for color chemistry but those molecules are bigger, stronger and take a longer time to break down jim k - Original Message - From: Colin Talcroft ctalcr...@yahoo.com To: pinhole-discussion@p at ??? Sent: Sunday, February 03, 2002 1:23 PM Subject: Re: [pinhole-discussion] Disposing of chemicals Someone was wondering about disposal of chemicals, a subject that has often bothered me. I did a little research by calling photo suppliers and local poison control people. There was surprisingly little information, but the consensus seems to be that most developers and stop baths are fairly benign and can be disposed of down the drain if well diluted (leave the water running). Spent fixer contains silver and therefore should not be disposed of this way. I keep a big plastic jug and store the stuff until the next toxics drive. Here in the US these drives are fairly common. When I lived in Japan there was no way to do this, so I had to just dump it, which always made me feel terribly guilty. Photoflo and other wetting agents are esentially mild detergents. These are OK. Selenium and many other toners are highly toxic and should not be dumped. There was some talk about alternative stop baths recently on the list. I guess things like citric acid and ascorbic acid would be even safer, as they are edibles. I am talking about BW chemicals. Color processing chemicals are entirely different, of course. If anyone knows more about this, please let us know. I don't want to pass on misinformation, so speak up especially if I am wrong about any of this. Colin __ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
[pinhole-discussion] Camera construction question...
When you're building a wooden camera like the ones on Jon Grepstad's website like http://home.online.no/~gjon/pinc120.htm how do you fix the back on...? I'm off to the shops tomorrow to see what I can turn up in the way of knobs and stuff and was wondering how everyone attached the back to these things. Cheers, Bob. http://pinhole.fatboab.org/ Crash programs fail because they are based on theory that, with nine women pregnant, you can get a baby in a month. -- Wernher von Braun
Re: [pinhole-discussion] small toilet darkroom
actually, this started as a note on the work of a photo student who lived in a small apartment, but it's interesting to see that there are more practitioners(?) out there! jim k - Original Message - From: robrien...@aol.com To: pinhole-discussion@p at ??? Sent: Sunday, February 03, 2002 12:36 PM Subject: Re: [pinhole-discussion] small toilet darkroom Rob, I think you're referring to Steven Pippin's work..he used a railroad station restroom as a pinhole camera obscura and used the toilet bowl as a developing tank. The Museum of Modern Art has copies of his book that accompanied his exhibit (he also used a washing machine pinhole camera obscura/lab)...Renee ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
[pinhole-discussion] Ag stuff
Funny that no one thinks about the developer as being silver bearing Some articles have rated it as being higher than Fixer regards Andy Schmitt AAndy LLC Computer Systems Created Perplexed Users UnPerplexed Dragons Slain,Ideas Generated Photographs Taken http://www.aandy.org Photography Head, Peters Valley Craft Center
RE: [pinhole-discussion] Disposing of chemicals
one way of removing a decent amount of the silver is to drop a steel wool pad into it let it sit for a while. A white precipitate, Silver Oxide (I think) is formed when the iron replaces the silver in the fixer. Unfortunately AgO is a very stable compound and is real difficult to refine into elemental silver...but at least you are keeping it out of the aquifer. There have also been small Silver Recovery units that precipitate the silver using electricity on eBay for a reasonable price. If you all want I can check the name of the maker post it. andy -Original Message- From: pinhole-discussion-admin@p at ??? [mailto:pinhole-discussion-admin@p at ???]On Behalf Of Colin Talcroft Sent: Sunday, February 03, 2002 1:23 PM To: pinhole-discussion@p at ??? Subject: Re: [pinhole-discussion] Disposing of chemicals Someone was wondering about disposal of chemicals, a subject that has often bothered me. I did a little r...snip __ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
[pinhole-discussion] not a home-brewer in your sense...
Hello Tom. I am not a home brewer of the grape variety. I am, however, an Art Teacher and Artist and brew up many objets d'art and sculptures du jour. ;-) Rosanne
Re: [pinhole-discussion] Disposing of chemicals
Hi all, The research I have examined says the same. The silver salts are heavy metals that are dangerous to the environment and eventually us again. What do others use for stop baths, if anything? I use 2 water rinses and move onto fixer. that's the way I learned it. tim Someone was wondering about disposal of chemicals, a subject that has often bothered me. I did a little research by calling photo suppliers and local poison control people. There was surprisingly little information, but the consensus seems to be that most developers and stop baths are fairly benign and can be disposed of down the drain if well diluted (leave the water running). Spent fixer contains silver and therefore should not be disposed of this way. I keep a big plastic jug and store the stuff until the next toxics drive. Here in the US these drives are fairly common. When I lived in Japan there was no way to do this, so I had to just dump it, which always made me feel terribly guilty. Photoflo and other wetting agents are esentially mild detergents. These are OK. Selenium and many other toners are highly toxic and should not be dumped. There was some talk about alternative stop baths recently on the list. I guess things like citric acid and ascorbic acid would be even safer, as they are edibles. I am talking about BW chemicals. Color processing chemicals are entirely different, of course. If anyone knows more about this, please let us know. I don't want to pass on misinformation, so speak up especially if I am wrong about any of this. Colin __ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ Timothy S. Midkiff Photographers get a Click out of life! ku...@vci.net psycho_...@excite.com
Re: [pinhole-discussion] Nearly Off Topic
Hi mickey, that's a very good idea. My adress is Ingo Guenther, Neisser Str. 7, D-26127 Oldenburg, Germany. I am glad to send the postcard, please give me your adress. You can also posted it to my Email adress ingoguent...@web.de regards ingo - Original Message - From: mickey michelbay...@webtv.net To: pinhole-discussion@p at ??? Sent: Sunday, February 03, 2002 1:42 AM Subject: Re: [pinhole-discussion] Nearly Off Topic hi brother..i also work with film canisters and would like to trade a postcard with you. Oh, btw. why dont we have a film canister postcard swap..regards mickey a happy life is made up of many happy moments ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
Re: [pinhole-discussion] Disposing of chemicals
Someone was wondering about disposal of chemicals, a subject that has often bothered me. I did a little research by calling photo suppliers and local poison control people. There was surprisingly little information, but the consensus seems to be that most developers and stop baths are fairly benign and can be disposed of down the drain if well diluted (leave the water running). Spent fixer contains silver and therefore should not be disposed of this way. I keep a big plastic jug and store the stuff until the next toxics drive. Here in the US these drives are fairly common. When I lived in Japan there was no way to do this, so I had to just dump it, which always made me feel terribly guilty. Photoflo and other wetting agents are esentially mild detergents. These are OK. Selenium and many other toners are highly toxic and should not be dumped. There was some talk about alternative stop baths recently on the list. I guess things like citric acid and ascorbic acid would be even safer, as they are edibles. I am talking about BW chemicals. Color processing chemicals are entirely different, of course. If anyone knows more about this, please let us know. I don't want to pass on misinformation, so speak up especially if I am wrong about any of this. Colin __ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com
Re: [pinhole-discussion] small toilet darkroom
In a message dated 2/3/02 1:39:46 PM, robrien...@aol.com writes: Rob, I think you're referring to Steven Pippin's work..he used a railroad station restroom as a pinhole camera obscura and used the toilet bowl as a developing tank. The Museum of Modern Art has copies of his book that accompanied his exhibit (he also used a washing machine pinhole camera obscura/lab)...Renee Is there a website for this? I gotta' see it. best, leezy
Re: [pinhole-discussion] small toilet darkroom
Rob, I think you're referring to Steven Pippin's work..he used a railroad station restroom as a pinhole camera obscura and used the toilet bowl as a developing tank. The Museum of Modern Art has copies of his book that accompanied his exhibit (he also used a washing machine pinhole camera obscura/lab)...Renee
[pinhole-discussion] Re:optimum focal length
Hi, I purchased a set of micro-drilled pinholes from pinhole resource. There was a list of apertures optimum focal lengths included and according to that, the optimum focal lenght for your .0039 aperture is 7.02mm and the approximate f-stop is f71. Gina http://home.ix.netcom.com/~ginabell/index.html
Re: [pinhole-discussion] `wrap around` 6x6 pinhole cylinder
Mike, I know the length may be a little long, but i've often wondered about the useing the tube that MM mini's candy comes in. I have used them for storing 120 rolls before. they fit pretty well and are a whole lot cheaper than commerically made tubes. since they come with their own snap lid maybe all you would need to do is make the PH, add film and tape the cap. let me know if it works. tim This pinhole camera maker is looking for cylinder container that can be snap or screw capped easily in dark. This should be made of material easy to cut such as that of a 35mm film can and be just large enough to hold a 6x6 snip of 120 roll film. It should have a diameter just large enough to line all but a quarter-inch or so with the film. I like to call it `wrap around panoramic`. Does anyone out there know of a product container that could be used in this way. -mike Timothy S. Midkiff Photographers get a Click out of life! ku...@vci.net psycho_...@excite.com
Re: [pinhole-discussion] `wrap around` 6x6 pinhole cylinder
In a message dated 2/3/02 2:43:15 AM, jonn...@thegrid.net writes: Just thought of something else... a 3 long threaded plastic pipe nipple would work also. You can get caps that screw onto the end, and you would have a choice of diameters to choose from. John
Re: [pinhole-discussion] `wrap around` 6x6 pinhole cylinder
Just thought of something else... a 3 long threaded plastic pipe nipple would work also. You can get caps that screw onto the end, and you would have a choice of diameters to choose from. John - Original Message - From: kathryn VAUGHAN To: pinhole-discussion@p at ??? Sent: Saturday, February 02, 2002 3:38 PM Subject: [pinhole-discussion] `wrap around` 6x6 pinhole cylinder This pinhole camera maker is looking for cylinder container that can be snap or screw capped easily in dark. This should be made of material easy to cut such as that of a 35mm film can and be just large enough to hold a 6x6 snip of 120 roll film. It should have a diameter just large enough to line all but a quarter-inch or so with the film. I like to call it `wrap around panoramic`. Does anyone out there know of a product container that could be used in this way. -mike
