Color changing compositions
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United States of America Patent
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Jul 5, 1994
Issued Date -
N/A
app pub date -
Jul 16, 1993
filing date -
Jul 31, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A multiple coloring composition system is disclosed whose coloring effect is changed upon treatment with a second coloring composition, once the second coloring composition has been deposited over the undercolor coloring composition. The multiple ink system comprises: (a) an undercolor aqueous coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater and/or by a reducing agent; and (b) an overcolor aqueous coloring composition comprising a colorant capable of maintaining its characteristic color in the presence of a pH of about 10 or greater and/or a reducing agent, a base in an amount sufficient to yield a pH of the overcolor composition of about 10 or greater, and/or a reducing agent.
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Cited Art Landscape
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