CA2152545A1 - Color changing compositions using acids - Google Patents

Color changing compositions using acids

Info

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
Application number
CA2152545A
Other languages
French (fr)
Other versions
CA2152545C (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.)
Crayola LLC
Original Assignee
Richard E. Miller
Charlene R. Couch
Binney & Smith Inc.
Binney & Smith Llc
Crayola Llc
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 US08/270,454 external-priority patent/US5489331A/en
Application filed by Richard E. Miller, Charlene R. Couch, Binney & Smith Inc., Binney & Smith Llc, Crayola Llc filed Critical Richard E. Miller
Publication of CA2152545A1 publication Critical patent/CA2152545A1/en
Application granted granted Critical
Publication of CA2152545C publication Critical patent/CA2152545C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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.
CA002152545A 1994-07-05 1995-06-23 Color changing compositions using acids Expired - Fee Related CA2152545C (en)

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)

Also Published As

Publication number Publication date
CA2152545C (en) 2000-02-01

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