Color changing compositions for highlighters
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United States of America Patent
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Feb 20, 1996
Issued Date -
N/A
app pub date -
Oct 3, 1994
filing date -
Jul 31, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A multiple coloring composition system is disclosed wherein the coloring effect of a first undercolor coloring composition is changed upon treatment with a second coloring composition, once the second coloring composition has been deposited over the undercolor coloring composition. The multiple coloring composition system comprises: (a) an aqueous undercolor coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater and/or a reducing agent, and a compatible surfactant in an amount sufficient to increase the stability of said coloring composition; and (b) an aqueous overcolor coloring composition comprising an overcolor dye capable of maintaining its characteristic color in the presence of a pH of about 10 or greater and/or a reducing agent, an effective amount of a base sufficient to yield a pH of the aqueous overcolor coloring composition of about 10 or greater and/or a reducing agent, and a compatible surfactant in an amount sufficient to increase the capillary flow of said aqueous overcolor coloring composition. The multiple coloring composition system is especially useful for highlighting text inasmuch as the coloring compositions preferably leave the highlighted indicia easily visible.
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