Color changing compositions
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United States of America Patent
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Oct 4, 1994
Issued Date -
N/A
app pub date -
Jun 16, 1993
filing date -
Jul 31, 1992
priority date (Note) -
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status (Latency Note)
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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 first coloring composition. The multiple ink system comprises: (a) a first aqueous coloring composition comprising a first dye whose coloring ability is destroyed in the presence of a bleach; and (b) a second aqueous coloring composition comprising from about 1% to about 20% by weight of a bleach; and from about 0.1% to about 12% by weight of a colorant capable of maintaining its characteristic color in the presence of a bleach and/or a pH of about 10 or greater. The multiple coloring composition may further comprise a base in an amount sufficient to elevate the pH of the second aqueous coloring composition to a level of from about 10 to about 12.
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Cited Art Landscape
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