- Fluorspar generates gases that can produce vivid blistering for special purpose effects.
- Magnesium carbonate is commonly added to glazes, especially at low fire, to make them crawl (it shrinks and cracks the glaze layer at the low end of firing and then its high melt viscosity pulls the glaze melt into islands). This often produces dramatic visual effects, especially if the crawling glaze color contrasts with the underlying body or slip. Additions vary from 10-30% depending on the host glaze.
- Bone ash encourages strong glaze textures; however, too much can produce crazing or blistering.
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