Quote Originally Posted by Ian Grant View Post
Ron, the smelted silver from iron sludge's is relatively pure after smelting, usually over 90% and up to about 96%, that is why there can be confusion, as we both know the sludges have a much lower silver content.


Yes, but the sludge before smelting can vary from low to medium or high depending on a huge variety of factors, and that is all I was pointing out.

The smelted silver at 90% - 96% is sill too impure for photographic use due mainly to iron contamination. The photo grade silver ingot must analyze to about 99.999% pure with a very very tiny fraction of iron, lead, mercury, zinc, copper.. well you get the picture.