CA2152545A1 - Color changing compositions using acids - Google Patents
Color changing compositions using acidsInfo
- Publication number
- CA2152545A1 CA2152545A1 CA2152545A CA2152545A CA2152545A1 CA 2152545 A1 CA2152545 A1 CA 2152545A1 CA 2152545 A CA2152545 A CA 2152545A CA 2152545 A CA2152545 A CA 2152545A CA 2152545 A1 CA2152545 A1 CA 2152545A1
- Authority
- CA
- Canada
- Prior art keywords
- overcolor
- coloring composition
- coloring
- undercolor
- composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Inks, Pencil-Leads, Or Crayons (AREA)
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.
(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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/270,454 | 1994-07-05 | ||
US08/270,454 US5489331A (en) | 1992-07-31 | 1994-07-05 | Color changing compositions using acids |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2152545A1 true CA2152545A1 (en) | 1996-01-06 |
CA2152545C CA2152545C (en) | 2000-02-01 |
Family
ID=23031386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002152545A Expired - Fee Related CA2152545C (en) | 1994-07-05 | 1995-06-23 | Color changing compositions using acids |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2152545C (en) |
-
1995
- 1995-06-23 CA CA002152545A patent/CA2152545C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2152545C (en) | 2000-02-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |