Method of preparing a dispensing pad for fingerprinting reagents

Details Method of preparing a dispensing pad for fingerprinting reagents Method of preparing a dispensing pad for fingerprinting reagents

1974-09-26

1976-06-01

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

118 315, 118264, 427 1, 428281, B29C 500

Patent

active

039606325

ABSTRACT:
An inkless fingerprinting system comprises a porous, non-yielding reagent pad saturated with a substantially colorless metallic salt solution, preferably based on ferric chloride, and means for applying an organic developer, preferably 8-hydroxyquinoline, to a latent fingerprint obtained by pressing the distal surface of a finger against the reagent pad and transferring the reagent adhering to the ridges of the finger onto a paper or plastic surface. The reagent and the developer interact to form a colored chelate and, thereby, render the fingerprint visible.

REFERENCES:
patent: 603841 (1898-05-01), Fairbank et al.
patent: 637985 (1899-11-01), Adams
patent: 714512 (1902-11-01), Nicholas
patent: 721474 (1903-02-01), Smith
patent: 1241322 (1917-09-01), Woody
patent: 2206042 (1940-07-01), Novae
patent: 2723476 (1955-11-01), Lyon
patent: 3851619 (1974-12-01), Cofield et al.

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