Colour forming composition
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United States of America Patent
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Oct 15, 2013
Grant Date -
Jun 23, 2011
app pub date -
Aug 26, 2009
filing date -
Sep 10, 2008
priority date (Note) -
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Abstract
A composition comprising i) a color forming component which is susceptible to changing color when irradiated; ii) an amine neutralised alkylaromatic sulphonic acid; and iii) a binder. Methods of marking a substrate comprising incorporating within or applying to a substrate the composition of this invention, and substrates coated with the composition, are also provided.
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