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Rutile pottery glazes are common, they are used from middle to high temperatures in oxidation and reduction. But they are troublesome (blisters and pinholes). A big issue is the supply of ceramic rutile, it can vary enough in chemistry and particle size to affect and even obliterate the floating blue aesthetic. Another issue is the slow death of the material Gerstley Borate, it is in most of the middle-temperature recipes. Many users have adjusted to source the boron from a frit instead (or adopted a frit based alternate recipe). But what happens when a frit is unavailable (either discontinued or by supply chain issues)? That happened with our MA6-C recipe, we had to switch to Fusion Frit F-12 from Ferro Frit 3134. However, as you can see, both the new rutile and frit are working OK (actually even better).
Glossary |
Rutile Blue Glazes
A type of ceramic glaze in which the surface variegates and crystallizes on cooling in the presence of titanium and iron (usually sourced by rutile) |
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