So this afternoon I decided to pick out a few copper plates and torch them. There are 2 plates that have an embossed pattern and these react to the heat by turning white. On the back they have turned orange. The flat plate has a more interesting pattern - lots of reds- but it is definitely in no way similar to using liver of sulphur. The LoS has a real vintage look. And the torching can be dangerous. While trying to remember not to touch the hot item and use my tongs, I nevertheless picked it up with my fingers. Eek! My index finger and thumb are blistered.