Color changing compositions using acids
First Claim
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1. A multiple coloring composition system comprising:
- (a) an undercolor aqueous coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 4 or less; 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 effective amount of an acid sufficient to yield a pH of said overcolor coloring composition of about 4 or less.
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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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Citations
28 Claims
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1. A multiple coloring composition system comprising:
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(a) an undercolor aqueous coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 4 or less; 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 effective amount of an acid sufficient to yield a pH of said overcolor coloring composition of about 4 or less. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An ink composition comprising:
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(a) an undercolor aqueous ink comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 4 or less in an amount of from about 0.5% to about 6% by weight of the undercolor ink; and (b) an overcolor aqueous ink comprising from about 0.5% to about 40% by weight of said overcolor ink of an acid; and
from about 0.5% to about 6% by weight of said overcolor ink of a colorant which maintains characteristic color in the presence of a pH of about 4 or less.
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25. A coloring changing marking system comprising at least one undercolor marking instrument and an overcolor marking instrument, said undercolor marking instrument containing an undercolor ink composition comprising a dye whose coloring ability is destroyed in the presence of a pH of about 4 or less, and said overcolor writing instrument containing an overcolor aqueous ink composition comprising (1) from about 0.5% to about 40% by weight of an acid;
- and (2) from about 0.5% to about 6% by weight of a colorant which maintains its characteristic color in the presence of a pH of about 4 or less.
- View Dependent Claims (26)
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27. A paint composition comprising:
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(a) an undercolor aqueous paint comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 4 or less; and (b) an overcolor aqueous paint comprising from about 0.5% to about 40% by weight of an acid;
from about 0.5% to about 6% by weight of an overcolor dye that maintains its characteristic color in the presence of a pH of about 4 or less; and
a thickener in an amount of from about 1% to about 5% by weight.
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28. A coloring composition comprising
(a) from about 0.5% to about 30% by weight of an acid; - and (c) from about 0.5% to about 6% by weight of a colorant which maintains its characteristic color in the presence of a pH of about 4 or less.
Specification