Imperial Chemical Industries Limited

Canon Kabushiki Kaisha

Arthur Quayle

Cecil V Stead

Peter Gregory

Brian R Fishwick

A method of security coding an article which comprises applying to the article an identification mark comprising at least one colorless or weakly-colored infra-red absorbing material and an article carrying one or more identification codes applied according to the method. The method is suitable for marking documents, currency and equivalents, such as cheques, credit cards and tickets, and for the identification of copyright materials and high valued added goods, such as tapes, cassettes, books, films, cameras, perfumes, spirits and designer goods to inhibit counterfeiting.

Security coding

The dye of the formula: ##STR1## which is suitable for use in aqueous inks, especially for ink jet printing.

Ink-jet ink containing lithium salt of copper complex monoazo dye

Lithium salt of copper complex monoazo dye

Water-insoluble monoazo dyestuffs of the formula ##STR1## wherein R is optionally substituted lower alkyl or phenyl, X is .beta.-hydroxyethyl or .gamma.-chloro-.beta.-hydroxypropyl, and Y is lower alkyl, a process for the manufacture of the said dyestuffs and their use for coloring synthetic textile materials in particular aromatic polyester textile materials.

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Bury, United Kingdom

Arthur Quayle