Latent image ink

Details Latent image ink Latent image ink

B - Operations, Transporting

41

M

B41M 5/132 (2006.01) A63F 3/06 (2006.01) B41M 3/00 (2006.01) B41M 3/14 (2006.01) C09D 11/00 (2006.01)

Patent

CA 2056283

1019-3 ABSTRACT OF THE DISCLOSURE A latent image ink particularly for use in printing forms such as games or colouring books. An offset lithographic press is used for imprinting a substantially invisible image on a sheet of standard paper. The latent ink used to form the latent image is a mixture of potassium ferrocyanide or other suitable colour forming iron complexing compounds, white ink and varnish. A developing solution such as ferric chloride or ammonium sulfate is subsequently added to the paper to render the image visible.

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