GBCG
DraftDescription
GBCG serves as a foundational crystalline glaze base suitable for firing ranges between Cone 6 and Cone 10. The formulation is primarily composed of Frit 3110, typically constituting 50% of the dry we
Original Author
Tony Hansen
Usage Instructions
GBCG serves as a foundational crystalline glaze base suitable for firing ranges between Cone 6 and Cone 10. The formulation is primarily composed of Frit 3110, typically constituting 50% of the dry weight to establish the maturing temperature. The SiO2:ZnO ratio is set at 2.5:1, providing the necessary stoichiometric balance for zinc silicate crystal growth. Zinc oxide typically comprises 25% of the recipe; adjustments to this value will directly correlate to crystal density. Silica content influences the suppression of crazing, though increased silica levels may inhibit crystal formation. Ancillary additives, such as titanium dioxide, MgO (sourced from dolomite, talc, or magnesium carbonate), Li2O (sourced from spodumene or lithium carbonate), and CaO, are commonly incorporated at 5-10% levels to modify opacity, crystal morphology, and color response. Successful application requires precise control of firing schedules, clay body selection, and chemical composition. Users should expect a significant experimental phase to master the variables of crystal development.