Color changing compositions using acids
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United States of America Patent
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Feb 6, 1996
Issued Date -
N/A
app pub date -
Jul 5, 1994
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 an overcolor, once the overcolor 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 an acid; and (b) an overcolor aqueous coloring composition comprising a colorant capable of maintaining its characteristic color in the presence of a pH of about 4 or less; and an acid sufficient to bring the pH of the overcolor composition to about 4 or less.
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Cited Art Landscape
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