Sympathetic ink and developer system

Details Sympathetic ink and developer system Sympathetic ink and developer system

B - Operations, Transporting

41

M

42/9

B41M 3/12 (2006.01) B41M 5/00 (2006.01)

Patent

CA 1310831

SYMPATHETIC INK AND DEVELOPER SYSTEM Abstract of the Disclosure A sharp imaging, non-smearing system for latent imaging and subsequent visual development of printed text or the like is provided which can be used on a variety of substrates (e.g. paper, metal, cloth, synthetic resins) and is extremely stable and easy to use. The system involves first imaging a substrate with an invisible non-blur- ring, non-sublimating ink containing a dissociable nickel salt such as NiSO4, with subsequent appli- cation of a liquid developer containing a dis- persed color precursor such as dimethylglyoxime which reacts with nickel ion to give a sharp, long lasting red color. The developer preferably includes an accelerator such as NaOH for accel- erating the above reaction so as to make it vir- tually instantaneous. The system of the present invention can be used in a variety of contexts, such as in self-testing materials or novelty items.

575944

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