Pre-dyes, mutable dye compositions, and methods of developing a color
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United States of America Patent
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Jul 28, 1998
Issued Date -
N/A
app pub date -
May 29, 1996
filing date -
Jun 5, 1995
priority date (Note) -
Expired
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Abstract
One embodiment of the present invention is a method and composition comprising a novel pre-dye molecule that is colorless and stable to ordinary light. The pre-dye molecule is capable of forming a color when exposed to certain wavelengths of electromagnetic radiation. A second embodiment of the present invention is a method of converting a conventional leuco dye to a colored composition by exposing the leuco dye admixed with a radiation transorber to certain wavelengths of electromagnetic radiation.
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