Kona F-4, 30
Gerstley Borate, 10
Frit #3134, 10
Dolomite, 10
Kaolin, 15
Silica, 25
Total, 100
Green Chromium Oxide, 0.5
In a first experiment, http://chromebrown.blogspot.com/ it was demonstrated that Green Chromium Oxide may produce browns : http://pagesperso-orange.fr/smart2000/chrome_chromium.htm Here we have a compromise between Brown and Green