Reverse-engineer a commercial transparent glaze to get the recipe

Monday 2nd September 2019

The commercial cone 04 clear brushing glaze on the left works really well on our bodies so I sent it away to be analyzed (about $130). From that information and using my account at I was able to create a recipe, having the same chemistry, employing two Fusion frits (which amazingly supplied all of the fluxing oxides). In this amazing cone 04 melt fluidity comparison they are almost identical (mine, G3879, has a little more surface tension). The Al2O3 and SiO2 levels would make, even a cone 6 glaze, jealous! So it should be very durable. And it has low thermal expansion (no crazing). With the bucket of dipping-slurry I made I can glaze a piece perfectly evenly in seconds rather than the normal 10 minutes of fiddling with a brush and three coats! I have used it on dozens of pieces, it's amazing. I can't wait to start adding stains!

Pages that reference this post in the Digitalfire Reference Database:

G3879 - Cone 04 Transparent Low-Expansion Base Glaze, A Low Cost Tester of Glaze Melt Fluidity, Getting a chemical analysis of your ceramic powder, How and where to have a glaze tested to learn its chemical analysis, This mug has waterlogged because it is not vitrified, Five low fire glazes: Which is the best?, Frit

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