In order for a silver ion to become metallic it has to pick up an
electron.  Glass with the impurities involved in making it, can act as a
solar cell and capacitor, carrying electrons on its surface. ANY
electromagnetic field will do to provide electrons there.
True:  If the electrodes are very close to the bottom of the container, a
high concentration of ions can interface with surface electrons and make a
very nice difficult to remove mirror.
 The other place to find a free electron is at the air to water interface
at the electrode which is also where water surface tension exists to trap
any metallic silver being made.
When using a DC output, ions create a high concentration pathway in the
water that forms an inverted arch between the electrodes.  If the apex of
this arch touches the glass, a mirror is very likely to form.
Stirring is nearly a necessity when using DC output on the electrodes.

If the water has enough hydrogen peroxide in it, you can make great big
shiny metallic silver flakes that grow and grow without raising the
conductivity of the water very much...not sure why, but I have done it.

On Tue, Aug 18, 2015 at 2:52 PM, Bob Smith <[email protected]> wrote:

> A friend recently started making EIS with the same one I have used for 15
> years.  He has been making it for a good year now with the same kind of
> generator.  He just made a batch and noticed a particle that was obviously
> silver in the bottom of the brew jar that measures 3/8 long X 1/8.  Plus
> when he wiped out the brew jar there were tiny specks of silver on the
> tissue.  I have never had this experience.   He is brewing at the 10 PPM
> level.    Ode????  Bob Smith
>