The next time I buy a bunch of materials to test an undocumented online recipe slap me!

Wednesday 28th November 2012

Look at recipes before wasting time and money on them. Are they serious? This is a cone 6 melt flow comparison between a matte recipe, found online at a respected website, and a well-fluxed glossy glaze we use often. Yes, it is matte. But why? Because it is not melted! Matte glazes used on functional surfaces need to melt well, they should flow like a glossy glaze. How does that happen? This recipe has 40% nepheline syenite. Plus lots of dolomite and calcium carbonate. These are powerful fluxes, but at cone 10, not cone 6! To melt a cone 6 glaze boron, zinc or lithia are needed. Boron is by far the most common and best general purpose melter for potters (it comes in frits and gerstley borate, colemanite or ulexite; industry uses more boron, zinc and lithia frits). The lesson: Look at recipes before trying them.

Pages that reference this post in the Digitalfire Reference Database:

B2O3, A Textbook Cone 6 Matte Glaze With Problems, Matte Glaze, Glaze Recipes

This post is one of thousands found in the Digitalfire Reference Database. Most are part of a timeline maintained by Tony Hansen. You can search that timeline on the home page of