CA2152652A1 - Latent Image Compositions - Google Patents
Latent Image CompositionsInfo
- Publication number
- CA2152652A1 CA2152652A1 CA2152652A CA2152652A CA2152652A1 CA 2152652 A1 CA2152652 A1 CA 2152652A1 CA 2152652 A CA2152652 A CA 2152652A CA 2152652 A CA2152652 A CA 2152652A CA 2152652 A1 CA2152652 A1 CA 2152652A1
- Authority
- CA
- Canada
- Prior art keywords
- undercolor
- composition
- colorant
- colorless
- latent image
- 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)
- Color Printing (AREA)
Abstract
A coloring system is provided in which an undercolor composition is applied to a substrate to thereby leave a colorless mark. The undercolor composition is then written over with an overcolor composition, thereby causing the undercolor mark to become colored. The overcolor composition may itself contain a colorant. In one embodiment, the color-changing effects are accomplished by employing a dye that is colorless in the presence of high pH
and / or a reducing agent, but that becomes colored as the pH is lowered, as the undercolor colorant. In a second embodiment, the color-changing effects are accomplished by employing a dye that is colorless at low pH, but that becomes colored as the pH is raised, as the undercolor colorant.
and / or a reducing agent, but that becomes colored as the pH is lowered, as the undercolor colorant. In a second embodiment, the color-changing effects are accomplished by employing a dye that is colorless at low pH, but that becomes colored as the pH is raised, as the undercolor colorant.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/317,321 | 1994-10-04 | ||
US08/317,321 US5503665A (en) | 1992-07-31 | 1994-10-04 | Latent image compositions |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2152652A1 true CA2152652A1 (en) | 1996-04-05 |
CA2152652C CA2152652C (en) | 2000-01-18 |
Family
ID=23233141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2152652 Expired - Fee Related CA2152652C (en) | 1994-10-04 | 1995-06-26 | Latent image compositions |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2152652C (en) |
-
1995
- 1995-06-26 CA CA 2152652 patent/CA2152652C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2152652C (en) | 2000-01-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |