I have been communicating with two European etchers who have been using my copper sulfate mordant for as long as ten years on zinc plates at large print studios. When it came to the disposal of the spent mordant, one group was told by a chemist to add sodium carbonate which would remove the zinc […]

I was alerted about a discussion on a blog forum concerning if the use of copper sulfate mordant was a good alternative to nitric acid. As I read the comments, I realized that was much confusion on the chemistry of using this safer mordant because either some had not studied thoroughly the articles available on […]