*This is the base recipe of a cone 10 tenmoku glaze that Rick Malmgren found works at cone 6 (as an almost black). In truth, although it appears to melt well, it scratches easily. The base recipe, although not flowing at all in this melt fluidity tester, does melt fairly well to a silky bone white matte at cone 6.
It is very unusual to find a recipe having no boron, lithia or zinc sourcing material in the base recipe yet still melting well enough to produce a hard glass. I believed it was impossible until I saw this.
Pictures
CM Top Ten cone 6 glazes - Tenmoku
This was the original source for this recipe. I was trying these glazes as a project to evaluate the technical merit of popular recipes used at cone 6.
Cone 6 G3834 flow test - base and iron added
The only difference between these melt flows is that the one on the right has 10% added iron oxide.
The porcelain tile in the front has also been fired to cone 6, notice that it scratches very easily.
The iron is appearing to act as a flux on the right, however it may be bubbling itself down the runway.
