G2926B glaze can precipitate crystals like this

Monday 19th January 2015

These crystals were found in a months-old bucket (about 2 gallons). These can appear even quicker, depending on factors like temperature, electrolytes in your water or solubility in the materials (evens insight-live.com/glossary/43">frits can be slightly soluble). The glaze slurry should be screened periodically (or immediately if you note the particles when glazing a piece). This is an 80 mesh sieve. Note the brush, using one of these gets the glaze through the screen much quicker than using a rubber spatula. The loss of material on the screen is tiny and inconsequential to the glaze. But it is crucial because these particles do not melt at cone 6, they will certainly mar the fired glaze surface if undetected.

Pages that reference this post in the Digitalfire Reference Library:

G2926B - Cone 6 Whiteware/Porcelain transparent glaze, Can frits be partially soluble? Yes, and here is what that means., The quality of frits is declining, Precipitation, Sieve

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.