(19)
(11) EP 0 474 404 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.08.1992 Bulletin 1992/32

(43) Date of publication A2:
11.03.1992 Bulletin 1992/11

(21) Application number: 91307724.4

(22) Date of filing: 22.08.1991
(51) International Patent Classification (IPC)5B41M 5/124, G09F 3/02
(84) Designated Contracting States:
DE GB NL

(30) Priority: 28.08.1990 NZ 235066

(71) Applicant: MOORE BUSINESS FORMS, INC.
Grand Island New York 14072-1697 (US)

(72) Inventors:
  • Dunn, Johnathan Brian
    Mount Albert, Auckland (NZ)
  • Maria, Paul Alexander
    Weymouth, Auckland (NZ)
  • Reid, Timothy Charles
    Pakuranga, Auckland (NZ)

(74) Representative: Spence, Anne et al
Fry, Heath & Spence St. Georges House 6 Yattendon Road
Horley Surrey RH6 7BS
Horley Surrey RH6 7BS (GB)


(56) References cited: : 
   
       


    (54) Substrates having revealable, non visible messages


    (57) The invention provides a substrate having an invisible message that is revealable. The substrate is formed of a recording sheet upon which is a first-image forming component that is capable of reacting with a complementary image forming component to produce a visible reaction product. The first image component is arranged on the recording sheet in a pattern corresponding to the positive or negative image of a desired message. Alternatively the recording sheet has a desensitising component on it that is arranged in a pattern corresponding to the positive or negative image of a desired message. In use, the desensitising component prevents the formation of the visible reaction product when the complementary image forming component is applied on the first image forming component.







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