> Russ Rosser wrote: > > replied that flat bar eventually assumes a "V" shape due to an "edge > effect." Therefore, A QUESTION TO ALL YOU WHO USE SILVER COINS: DOES > THE ANODE REMAIN ROUND OVER ITS LIFESPAN on their way to becoming a > piece of silver foil?
Hi Russ, My silver coin started out about four years ago at 1.53" in diameter by .125" thick. It is presently 1.36" in diameter by .08" thick in the center and .05" around the edges, and still quite round. The leading and trailing edges in the water current of the stirrer are the same thickness, and the coin appears to be eroding(?) pretty equally all the way around. This coin had a big eagle head on the front which was about flush with the raised rim around the edge. The edge (and eagle head) was about .02" above the flat surface of the coin. A very soft image of the eagle head is still discernible and this accounts for the difference between middle and edges. The back of the coin had some light artwork nowhere near as substantial as the eagle head, and the back is essentially flat. I suspect the raised and knurled edge might raise the surface area substantially when the coin is new, so there would be an initial rapid fall-off in surface area as the edge became smooth, and ideal current or time set for a ridged coin would be different than for a smooth one. Anyone? I use 30 VDC with a stirrer motor in a quart jar, silver round for the anode and .130"x4" stainless rod for the cathode. Run until the current rises to 1mA which takes several hours. Much higher than 1mA and silver starts rapidly precipitating on the cathode. Wipe the cathode but not the anode. No special reason for the size/shape cathode; it just happened to be what I had and I never replaced it when I replaced the silver wire with the silver coin. Ron KC7ZWA -- 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: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
