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Specific gravities on three commercial glazes might surprise you

The freshly opened transparent low fire glaze on the left has a specific gravity of only 1.34 (that is a high water content). Yet it is viscous because they add alot of gum. It needs three coats to go on thick enough and takes quite a bit of time to dry each one. When dipping, a very thick layer dries very slow and thin. That being said, transparent glazes do need to be applied thinner, AMACO is likely trying to assure that by producing at this low specific gravity. The center Potter's Choice glaze, made by the same company, is 1.52 (that is a much better deal). And it goes on nice and thick. The Celadon glaze on the right is lower, 1.46. Glaze manufacturers can produce at a broad range of specific gravities, they just adapt the percentage of gum to impart the viscosity they want. While it is sensible to use commercial special-effect paint-on glazes, clear cover glazes are best mixed yourself and applied by dipping or pouring.

Specific gravities on three commercial glazes might surprise you

Links

Glossary Specific gravity
In ceramics, the specific gravity of casting slurries and glazes tells us their water-to-solids. Body slurries especially require tight control of this property for performance reasons.
Glossary Brushing Glaze
Hobbyists and increasing numbers of potters use commercial paint-on glazes. It's convenient, there are lots of visual effects. But there are also issues compared to making your own.

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