CA2152652A1 - Latent Image Compositions - Google Patents

Latent Image Compositions

Info

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
Application number
CA2152652A
Other languages
French (fr)
Other versions
CA2152652C (en
Inventor
Richard E. Miller
Charlene R. Couch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Binney and Smith Inc
Original Assignee
Binney and Smith Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US08/317,321 external-priority patent/US5503665A/en
Application filed by Binney and Smith Inc filed Critical Binney and Smith Inc
Publication of CA2152652A1 publication Critical patent/CA2152652A1/en
Application granted granted Critical
Publication of CA2152652C publication Critical patent/CA2152652C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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.
CA 2152652 1994-10-04 1995-06-26 Latent image compositions Expired - Fee Related CA2152652C (en)

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)

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