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Photoactivatable leuco base time-temperature indicator

  • US 4,917,503 A
  • Filed: 09/30/1987
  • Issued: 04/17/1990
  • Est. Priority Date: 12/02/1985
  • Status: Expired due to Term
First Claim
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1. A photoactivatable time-temperature indicator, comprising a mixture of(a) a thermally inactive compound that comprises a leuco base and(b) a photosensitive compound that, on exposure to actinic radiation, forms an acid that converts the leuco base to a thermally active product.

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