Crackle glaze, craquele
A type of glaze that is intentionally crazed. Stains and other colorants are often rubbed into the crack lines to heighten the effect. Crackle glazes almost always have very high KNaO (to raise the thermal expansion). These high levels push the contents of other fluxes abnormally low or completely exclude them. Crackle glazes also have lower Al2O3 (sometimes very low). Thus they will have fluid melts and tend to run. It is common to find high amounts of Ferro Frit 3110 (or similar frits) in the recipes, up to 90%. These recipes are employed all the way from Raku to cone 6 (obviously melting more as the temperature increases).
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