EP 0474404 A2 19920311 - Substrates having revealable, non visible messages.
Title (en)
Substrates having revealable, non visible messages.
Title (de)
Träger mit wieder sichtbar zu machenden unsichtbaren Daten.
Title (fr)
Supports à pouvoir révélateur avec des messages invisibles.
Publication
Application
Priority
NZ 23506690 A 19900828
Abstract (en)
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. <IMAGE>
IPC 1-7
IPC 8 full level
B41M 5/124 (2006.01); G09F 3/02 (2006.01)
CPC (source: EP)
B41M 5/124 (2013.01); G09F 3/0291 (2013.01)
Designated contracting state (EPC)
DE GB NL
DOCDB simple family (publication)
EP 0474404 A2 19920311; EP 0474404 A3 19920805; AU 646067 B2 19940203; AU 8274691 A 19920305; CA 2050051 A1 19920301; JP H04323076 A 19921112; MX 9100835 A 19920401; NZ 235066 A 19940627
DOCDB simple family (application)
EP 91307724 A 19910822; AU 8274691 A 19910828; CA 2050051 A 19910827; JP 24039091 A 19910827; MX 9100835 A 19910828; NZ 23506690 A 19900828