Way to glow

By Barry Fox Do your dayglo T-shirts fade quickly in the wash? Matsui Shikiso Chemical Company of Kyoto says it can make luminous pigments more waterproof, letting them stay brighter for longer (GB 2 341 869). Calcium sulphide glows in the dark, but only for a short time unless doped with radioactive chemicals. The new idea is to dope strontium aluminate powder with a rare-earth metal, add phosphoric acid and heat to 70 °C for four hours. The acid is then run off, and replaced by sodium hydroxide for four hours. After drying, the powder has “tremendously increased” water resistance,
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