Re: Please validate website claim and my method of making Colloidal Silver

RE: The entire coin is suspended underwater by means of a 14 gauge .9999 silver wire attached to the coin through a hole I drilled near the top of the coin. In this manner, there is about 1.25" of the silver wire submerged in the water.

A. Based on this, the estimated time to 19ppm would be aprox:

@ 0.3 mA = 15 hrs
@ 1.0 mA = 4.5 hrs

However, it's important to note that these figures do not account for the ramp-up time required for the electrolytic cell(glass, water and electrodes) to reach full potential. - that is to say, that the calculation only accounts for processing under ideal conditions(or current limit), and so an accurate calculation would require the addition of data points taken throughout the ramp-up stage(w/multimeters) to compensate for the time required for the cell to reach its full potential(ie, 30v @ 0.3 mA running).  - leaving us with a minimum time reference at best . ie, the minimum time required to reach full saturation @ 0.3 mA would be aprox. 15 hours, type thing

Beyond this, and at the risk of being the contrarian, I'm not sure running your anode so far bellow potential is helpful either. ie, in cases such as these(electrolytic process) the processing dwell time becomes a contender in the overall quality of the solution. IOW. the longer it takes to process, the greater the potential for bi-products to occur in processing.  - such is the nature of the chemistry

Therefore, and with that being said, I'd recommend(if possible) that you consider adding a mechanical stirrer(even a passive one) and running your anode closer to its potential(@ 1 mA p/sq in). Which works out to be along the lines of 3.5 mA - putting your process time in the 1.2 - 1.5 hr range. 

Hope this helps.