That clear compound used to cover porcelain, pottery, yielding a very hard surface after the kiln process...  What is it made of ? 

It is sold as a thick liquid ?

Edited September 25, 20178 yr by Externet

Glaze is essentially a slurry of powdered glass in water.

On 9/24/2017 at 9:31 PM, Externet said:

That clear compound used to cover porcelain, pottery, yielding a very hard surface after the kiln process...  What is it made of ? 

It is sold as a thick liquid ?

Many artists call glaze “liquid glass”, but I can’t quite understand the chemistry that this statement references. Glaze is essentially a liquid mixture of metal oxides, such as silica (silicon dioxide) and, in the 1940’s, uranium oxides.