Depositing latent fingerprints and development thereof

Details Depositing latent fingerprints and development thereof Depositing latent fingerprints and development thereof

1977-08-05

1979-11-13

Smith, Ronald H.

Coating processes

Body member printing

427 7, 427145, A61B 510

Patent

active

041744098

ABSTRACT:
Latent fingerprints having a latency of several weeks are applied to paper substrates using compositions comprising trimeric aliphatic acids of at least 30 carbon atoms which are substantive to paper fibers are substantially non-volatile, and are non-hardening, non-toxic and non-hygroscopic. The latent fingerprints are developed as desired by dusting in the conventional manner with toner particles, suitably, comprising magnetic particles in oleophilic matrix.

REFERENCES:
patent: 2334850 (1943-11-01), Taylor
patent: 2341239 (1944-02-01), Percy
patent: 3239545 (1966-03-01), Rogler
patent: 3251869 (1973-04-01), Putnam
patent: 3377286 (1968-02-01), Nelson
patent: 3639245 (1973-12-01), Glaser
patent: 3776865 (1968-04-01), Stricklin
patent: 3823022 (1974-07-01), Thomas
Research Disclosure-Jul. 1973.
Kirk-Othmer Encyclopedia of Chem-Tech., 2nd Ed., vol. 8, pp. 847-849, 1965.

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