50 Gerstley Borate
20 Frit 3269
15 Nepheline Syenite
15 Lithium Carbonate
Add:
17 Synthetic Bone Ash
6 Tin Oxide
5 Copper Carbonate
1 Cobalt Carbonate
Photo is of two test tiles both fired in the same kiln to 1875 degrees F and reduced in the same 10 gallon can with 6 sheets of newspaper (3
torn into strips). Lid was placed on the can immediately which produced a medium reduction. Can was not burped and tiles were left
to cool.