G2571A bamboo matte on the left is better, it does not stain

Monday 14th May 2018

These mugs are Plainsman H443. The insight-live.com/glossary/174">bamboo glaze on the left (A) has 3.5% rutile and 10% Zircopax added to the base G2571A dolomite matte. The one on the right (B) has the same addition but in a base having slightly less MgO and slightly more KNaO. B stains badly (as can be seen from the felt marker residue that could not be removed using lacquer thinner). Why does A stain only slightly? It has an additional 4% Gerstley Borate (GB). GB is a powerful flux that develops the glass better, making the surface more silky. The differences in the recipe provide another advantage: (A) has a lower thermal expansion and is less likely to craze.

Pages that reference this post in the Digitalfire Reference Library:

G2571A - Cone 10 Silky Dolomite Matte glaze, GR10-J1 - Ravenscrag Cone 10R Bamboo Matte, Bamboo Glaze, Staining of Fired Ceramic Glazes

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.