Plainsman Clays | TIDI
Titanium Dioxide
Titanium dioxide dissolves into a glaze melt and crystallizes again as the kiln cools. The amount decides whether it variegates a surface or whitens it.
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Titanium dioxide is often one of the first materials to come out of solution as a glaze cools, so it seeds the crystals that other materials grow around. A small addition dissolves completely into the melt and has little visible effect on the glaze. A few parts in a hundred give the mottled, streaked surfaces it is known for. Around a tenth of the recipe whitens a glaze, and beyond that the glaze turns opaque and patterned with a yellow tone. An addition of cobalt can help it shift towards green. Because the crystals grow during cooling, the cooling rate has as impact on the effect as well as the amount used.
- Titanium dioxide, it dissolves into the melt and crystallizes as the kiln cools
- The crystals scatter light, giving variegation at low additions and opacity at higher ones
- Commonly a few parts in a hundred up to about a tenth of a glaze
