Hi Bob, Thanks for the feedback. I circulate 55 degree tap water around the production vessel and that's about as cool as it gets. I don't want to get into using ice if at all possible. Did notice the CG got pretty warm and started evaporating without the cooling tank.
I'm arcing about 2 inches underwater and am using glass tubes to enclose the electrodes. I also leave about 1/8" to 1/4" extending beyond the tube ends. I notice two types of arcing. If the electrodes are about 3/32" apart the sound is fairly loud with fresh DW and the arc is a bright blue with quite a few bubbles formed. As the water gets more gold in it the arc wants to extinguish so I have to narrow the gap. It then makes a more uniform sizzling sound reminiscent of eggs frying. and the arc color changes to a reddish blue. I'm only using 9 KV at 60 Ma. So the arc stability is a problem as the water gets conductive. It has to be about 1/16" after a while. Did you notice the bubbling, arc color and spacing had anything to do with the end CG color? I seem unable to pin down the reason for it being violet one time and gray the next. Trem ----- Original Message ----- From: "Robert Berger" <bober...@swbell.net> To: <silver-list@eskimo.com> Sent: Monday, August 25, 2003 2:26 PM Subject: Re: CS>Colloidal gold > Hi Trem, > > I spent a couple of months fiddling with underwater arc for colloidal > gold. > > The first lesson that I learned was to keep the DW as cold as possible > so as to sustain the arc. I used a large pot to hold ice water to keep > the brew cell cold. > > One other person set up a recirculating system with a 250 gallon child's > wading pool to cool the recirc. water. > > I had best results when the arc was abut 1/2" below the water surface. > However that required that the gold electrodes were incased in pyres > glass so that only about 1/8" of gold was exposed. > > I also found the by having the tip of an adjustable elctrode strike the > other (fixed) electrode on its side, I had better arc control and could > adjust the arc with power on. Be careful here on how you insulate the > moving electrode as 15 kv gives a nasty bit! > > I just took a break to measure the CG that I have on the shelf. > 1.84 ppm; Cf =37 uS/cm; Very light violet in color > 3 ppm; Cf = 12 uS/cm; light violet in color > 8-10 ppm (mesogold) Cf =31 uS/cm light redwine color. > > The 1.84 and the 3 ppm were measured by Lynn Kimball. > > I guess I need to set up and make some more. > > I even made a thermoelectric cooler to try on this project. > > "Ole Bob" > > > > > -- > The silver-list is a moderated forum for discussion of colloidal silver. > > Instructions for unsubscribing may be found at: http://silverlist.org > > To post, address your message to: silver-list@eskimo.com > > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > > List maintainer: Mike Devour <mdev...@eskimo.com> >
