GBS - Gerstley Borate SubstitutesBe careful, many of these materials are approximate substitutes (e.g. they have similar chemistry but much different physical properties). There is no exact substitute.
Out Bound Links
Colemanite - 2CaO.3B2O3.5H2O or CaB3O4(OH)3·H2O
Ulexite - NaCaB5O9Â·8H2O - Sodium calcium borate
Boraq - Plainsman Plastic Gerstley Borate Substitute
Gillespie Borate - Gerstley Borate Substitute
Fusion Frit F-309 - Calcium borate frit, Gerstley Borate substitute
Fusion Frit F309
Laguna Borate - Gerstley Borate Alternative
Gerstley Borate - Plastic Calcium Borate
Colemanite, Calcium Borate, Borocalcite
Subsituting Gerstley Borate in Floating Blue
Details how to substitute Gerstley Borate for another boron source in the popular Floating Blue glaze recipe. The lesson demonstrates that the most practical way to deal with the GB issue is on a glaz...
Ferro Frit 3134 - Leadless and low alumina high calcia borosilicate frit