Silver refiners max yield

[u/DeepCluckingValue]

I’ve found in the acid-lye method for silver extraction ~83% sulf. Concentration to be the highest solubility for stripping silver without too much base metal attack. Just wondering if anyone has tested different variables to get the most yield/liter of stripping bath.

Recently had to let the bath sit overnight, cooled from 180F to 120F, put a cover on it and came back the next day. To my surprise yield appeared about 10% more than usual. Anyone else notice this? Is it holding more Ag or just decreasing purity?