I’m well aware of other, easier, ways to apply an etching resist to copper, but I REALLY want to try the style Imago Corvi uses, which is a mixture of asphaltum, beeswax, and rosin. I have all the ingredients, but don’t know the percentage of each to use.
Here’s a movie of her process. https://youtu.be/7DhKVDKw1mc?si=_MH-d4XbMn9SNhQ7
Happy news! While reading the comments, I found the exact percentages I needed! In case anyone else needs them: Digication ePortfolio :: Vitreous Enameling :: Making resist
Excellent! Thank you for your time.