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Assembly or set of different color inks and an assembly of writing instruments

  • US 5,549,742 A
  • Filed: 04/27/1995
  • Issued: 08/27/1996
  • Est. Priority Date: 09/18/1992
  • Status: Expired due to Term
First Claim
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1. A set of inks for forming polychromatic markings, comprising:

  • a first reservoir,a first ink, disposed in said first reservoir, comprising a reducible colorant provided in oxidized form, in which form said colorant produces a marking of a first color when applied to white paper, said reducible colorant producing, when applied to white paper and reduced, a visible marking having a second color different from said first color,a second reservoir, anda second ink, disposed in said second reservoir, comprising a reducing agent selected to reduce said reducible colorant, and a second, non-reducible colorant that, when applied to white paper, produces a marking having a third color that is different from said first and second colors.

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