This is G3903, a variation on the GA6-A base Alberta Slip honey glaze for cone 6 (but these pieces are fired at cone 5). Its secret is Fusion Frit FZ-16 (high in both B2O3 and ZnO), this is the lowest melting frit we have ever seen. The 20% frit in this recipe is excessive for cone 6, likely 15% or even less would do. Even at cone 4 the glaze is super glossy at the 20% level. An amazing aspect is its slipperiness: Glazed test tiles of this cannot be stacked, they just slide off each other! Put a few coins in that bowl, move it around a little and they slide around and just fly right out! And, I must hold pieces tightly or they will slide out of my hands. Given that this glaze is 80% of a raw native clay and the pieces are made from M340S it is amazing that this small percentage of frit could produce such a brilliant surface. Notice also that it washes away the manganese speckle. Please note: We do not yet stock this at Plainsman Clays (but I am working on it).
Fusion Frit FZ-16
The champion in our frit melt-off competitition. This frit showcases the amazing fluxing power of boron and zinc working together. It is 15.5% ZnO.
Also called "middle temperature" by potters, cone 5 (~2160F/1180C) refers to the low end of the temperature range at which most hobby and pottery stonewares and porcelains are fired.