Before spending time trying online recipes, take a minute to do a sanity check on them


Wednesday 28th November 2012

This is a cone 6 GLFL test to compare insight-live.com/glossary/112">melt-flow between a matte recipe, found online at a respected website, and a 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. Even though this recipe has 40% nepheline syenite, lots of dolomite and calcium carbonate it is not melting. Yes, 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 mainly in frits, gerstley borate). The concept of a limit recipe applies, the idea of eye-balling a recipe and quickly assessing if it is ridiculous or not.

Pages that reference this post in the Digitalfire Reference Library:

B2O3, A Textbook Cone 6 Matte Glaze With Problems, Limit Recipe, 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 digitalfire.com.