Initially this recipe had barium in it which can't be used on functional wear - so I wanted to take it out.
Recipe is now:
Soda Feldspar 42
Whiting 8
Zinc Oxide 50
Bentonite 2
It works in both oxidation (matt) and reduction (glossy)
Tests have been done on 5B, Keanes Porcelain and RGH
Top row in oxidation and the bottom row reduction