Safelight filter

Details Safelight filter Safelight filter

1975-04-28

1976-07-27

Peters, Jr., Joseph F.

Buckles, buttons, clasps, etc.

240 1066, 240 20, F21V 900, F21L 1504

Patent

active

039719294

ABSTRACT:
The invention comprises a darkroom safelight having (a) a light filter consisting of negative color film which has been exposed to a white light source (such as a generally continuous, uninterrupted light-reflective surface illuminated by white light) and then developed with color developer, and (b) at least two color filters selected from the colors of magenta, cyan and yellow. The minimum densities of these color filters are determined by the work-fogging factor; the maximum densities are determined by the factor of visual illumination of the work area.

REFERENCES:
patent: 2263684 (1941-11-01), Ryan
patent: 2297974 (1942-10-01), Moore
patent: 2734435 (1956-02-01), Leonardi
patent: 2997389 (1961-08-01), Boon
patent: 3405262 (1968-10-01), Dolan et al.

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