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While these are available as commercial products you may want to mix your own to get maximum flexibility in surface character and color intensity. The key is phosphorescent pigments added to a transparent base recipe. The pigments are often made from strontium aluminate doped with rare earth elements like europium and dysprosium. This ebay search reveals they are readily available (using the search 'strontium aluminate glow powder'). While expensive, they are much less so than materials like cobalt oxide or lithium carbonate. These pigments are known for their long-lasting glow compared to older zinc sulfide-based products. It would be best to start at low temperatures, cone 04-06. Consider trying the G1916Q glaze base recipe first (then G3879, if you can get the frit). The Q recipe is temperature, thermal expansion and gloss adjustable (using different frits and frit mixtures). A common starting point is 10-20% pigment by weight.
Recipes |
G1916Q - Low Fire Highly-Expansion-Adjustable Transparent
An expansion-adjustable cone 04 transparent glaze made using three common Ferro frits (low and high expansion), it produces an easy-to-use slurry. |
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