[John Bartley]

There is a product out there called "liquid salts". As far as I know it is sodium hydroxide and it has to be heated from a solid to a liquid in order to work. I have some here that I bought to strip the "unstrippable" Litz wire that is found on the market. It works and works well.

https://www.eraser.com/

I melted mine in a little cast iron pot that I used to use for melting lead for musket balls ....