Ceramic Quiz 9

Name the two main sources of Boron in glazes:




Anonymous said…
Gerstley borate
Frit s
Maggie said…
gerstley borate
boron frits
June Perry said…
The keywords was mainly. There's also straight borax which is called for in some glazes and slips.
John Britt said…
June is right. Any of those would be acceptable but the main source is frits and gerstley borate. Borax is a great source but is soluble so fritted boron sources are often used. But in raku glazes,as Shane Mickey had found, borax is often used in high quantities.
Anonymous said…
is colmanite also a source? I worked in a studio that used culminate and greatly borate interchangably