Trem,
Could it be that the process is mining into the the mass of silver, corroding tunnels and cavities, while leaving the surface fairly intact? This is classic in stainless steel where the bottom of the hole is preferentially corroded, leading to disasterous cracks very quickly. This usually happens close to welded areas and also in stressed areas.
Tony

Trem wrote:
Well this is really interesting. Since the electrodes have about 2.3 or a bit more ounces of usable silver and they are still there although reduced in thickness a bit and since I know the PPM is not .3 but 20 because of independent lab tests, there can be no explanation other than I was mistaken in the estimated quantity produced. See below for further comments. Trem



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