In the book "The Ceramic Spectrum" by Robin Hopper, he states that copper can produce a purple and plum color in both oxidation and reduction, cone 6 thru 10 in high alkaline or barium/zinc glazes. I was wondering if anyone out there is familiar with this coloring from copper. Anyone have a recipe? I would like to run some tests on this type of glaze. If I had a proven recipe as a starting point, I could probably save countless tests narrowing in on a workable glaze.
Also, I wonder if strontium could replace the barium and still retain the coloring. Any hints? Thanks. - Mike