Infra-red responsive fingerprint composition and method of makin

Details Infra-red responsive fingerprint composition and method of makin Infra-red responsive fingerprint composition and method of makin

1979-02-09

1980-10-07

Gron, Teddy S.

Compositions

Nonreactive analytical, testing, or indicating compositions

106 19, 106 21, 106129, 2523014R, 427 1, 427145, A61B 510, C09K 300

Patent

active

042267404

ABSTRACT:
An infra-red responsive fingerprint composition and method for manufacturing by sifting and mixing a minor proportion of finely divided carbon black (50 to 75 millimicrons) and a major proportion of infra-red responsive finely divided pigments containing milori blue (250 to 400 mesh), manganese dioxide (300 to 400 mesh), aluminum powder (1 to 75 microns) and mica (10 to 20 microns). A small amount of gum arabic as binder is included to facilitate adhesion of the print powder to latent prints. On white surfaces the fingerprint powder is black. On dark surfaces the fingerprint powder is brightly reflective so that when lifted or transferred to a white backing the color changes from brightly reflective to black. The reflective color becomes even more vivid under infra-red. Storage is preferably in tightly sealed containers in the presence of dessicant capsules to prevent moisture pick-up and caking of the gum arabic.

REFERENCES:
patent: 1259981 (1918-03-01), Hedrick
patent: 1539448 (1925-05-01), White
patent: 1667542 (1928-04-01), Flanagan
patent: 1951203 (1934-03-01), Pitman
patent: 2299652 (1942-10-01), Rahn
patent: 2447322 (1948-08-01), Fonda
patent: 2986831 (1961-06-01), Terek et al.
patent: 3075852 (1963-01-01), Bonora
patent: 3132036 (1964-05-01), MacDonell
patent: 4176205 (1979-11-01), Molina
patent: 4182261 (1980-01-01), Smith et al.

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