Method of printing non-visible messages and revealing the same

Details Method of printing non-visible messages and revealing the same Method of printing non-visible messages and revealing the same

B - Operations, Transporting

41

M

B41M 3/14 (2006.01) B41M 5/124 (2006.01) B41M 5/132 (2006.01) G09F 3/02 (2006.01)

Patent

CA 2050051

ABSTRACT The invention provides a substrate having an invisible message that is revealable. Previously such substrates had an opaque layer sprayed over the message which then had to be scratched off. The substrate of the invention 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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