Ian, my other posting did not address your question on safety of silver chloride. Most knowledgeable folks at this site tend to view it as harmless though somewhat ineffective. But I know of one authority here in Australia who considers it and other similar silver compounds to present a longer term threat of kidney failure. The man is Bill Briggs, and he may be contacted at: bill-bri...@silvercolloidaustralia.com
This is a controversial topic!