THe black particles are probably silver oxides that were blown off one
electrode by over agressive bubbles.  They won't hurt anything but slowing
the bubbler down will probably keep them stuck on the electrode where they
belong.
 Stirring should be gentle to the max.  It doesn't take very much water
motion at all. One to three fair sized bubbles per second should be enough,
or a slow stream of very small bubbles.
 For instance:
 A 7 watt night light bulb held very close to the bottom of the container
is enough to induce thermal stirring currents sufficient to distribute the
"ion cloud".  It's so little heat that an 8 oz container will only gain
about 5 degrees in 2 hours depending on room temperature...which, with
container surface area, determines heat dissipation from the surface of the
container.
Ken


At 02:13 PM 1/19/02 -0700, you wrote:
>Tried my first CS makeing. Kens posts on color and current helped. Still
>need some expert opinion on result.
>
>Equipment is toy train speed control ( found in thrift store for $1.20)
>claims 16 volts DC but produces 17.6 at all speed settings. Controls current
>flow. Coins 3/4 way into water set at 1 inch for first batch 3ma in quart
>jar. 2 1/2 hours. Stirring with bubbler. Not perfectly clear with strong TE,
>definite taste. Some black particles in bottom of jar.
>
>Changed to gallon ice tea bottle, about 3/4 full, same settings, ran for 6
>hours. got brown color, strong taste, strong TE. Lot of black clumps in
>bottom of jar.
>
>Read Kens post that 1 5/8" spacing and low current flow was the way.
>Increased coin spacing to about the 1 5/8" and set current to 1ma. Ran for 4
>hours, clear with week TE and taste. 6 or 8 small black particles in bottom
>of jar.
>
>Current flow was stable once set, never varied with increase in silver.
>Seems that speed control gives constant current.
>
>My guess is first was close, second particles much to big and last is mostly
>ions. Is the ion one of any use.
>
>Welcome any comments.
>Ron
>
>
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