The way that I remove the PnP is after I have achieved all the etch
that I want, I rinse the plate in running water to remove any
chemicals and then place it in a covered container containing
household lemon ammonia. It works!!! Please make sure that the
container has a tight fitting lid so the fumes remain inside the
I let it sit for a while until I see the film lifting, and then
scrub well with a sponge or stiff nylon brush and use some fine
pumice powder to make sure all the PnP is removed. It may take some
time to soak, but it is very efficient and I am doing something else
while it is in the ammonia bath. Takes off all the PnP with very
little effort on my part.
Unique Solutions, Inc.
Paste Solder and Powder Solder for Jewelers and Metalsmiths