Technicolor related patent on dyes - 1972 -US 3835781 A

[Mustafa Umut Sarac]

Mustafa Umut Sarac submitted a new resource:

(there was a url link here which no longer exists) - Technicolor related patent on dyes - 1972 -US 3835781 A

You can download full patent from google patents , I copied the most important parts.

DYE COLOR INDEX NUMBER Pontamine Fast Red 8 BLX 28160 Pontamine Fast Orange 40265 Fast Red S Conc. 15620 Congo Red 48X 22120 Pontacyl Carmine 6B Extra Conc. 18055 Pontacyl Scarlet R Conc. 23910 Pontacyl Rubine R Extra Conc. l4720 Acid Magenta 0 42685 Pontamine Fast Yellow RL 29025 Metanil Yellow WS [3065 Anthracene Yellow GR 13290 Erie Yellow F Conc. 40000 Acid Green SN Extra 44090 Acid Green 42095 Ink...

(there was a url link here which no longer exists)

 

[Dan Fromm]

I looked at the patent.

Abstract

Process for exhibiting and evaluating the effects of variation in dye concentration on the saturation and hue of dyes useful in color photography, dye imbibition transfer processes. The process comprises preparing a crossed step wedge on a dye transfer matrix film, dyeing the processed matrix in a given transfer dye solution, and transferring the crossed step wedge dye images to a reception material. The density, saturation and hue of any individual step of the transferred dye images is referenced to any other step of the positive dye wedge by relative exposure indicia in each step. The crossed step wedge dye positive serves as a relative exposure guide for producing positive color prints from non-color negatives using imbibition dye transfer processes.

It really clearly has to do with color printing, so fits here. But it is mainly about testing dye concentrations and matrix exposures when making dye transfer prints starting from b/w negatives, i.e., trichromy.

SUMMARY OF THE INVENTION

An object of this invention is to provide a method for producing colored photographic reproductions of non-colored originals.

A further object of this invention is to provide an improved dye transfer method for producing two or more differently colored photographic reproductions of the same non-colored original.

A still further object of this invention is to provide a photographic dye transfer method for preparing a graduated step wedge showing the variation in saturation and hue of a given transfer dye with known variation in exposure of the imbibition matrix.

Still another object of the present invention is to provide a method for producing colored photographs by dye transfer processes using a graduated step wedge of the dyes to determine the exposure of the imbibition matrix required to produce the desired color.

This invention has as another prime object to provide a method for testing and exhibiting the color, hue and saturation characteristics of dyes useful in dye imbibition transfer processes.

There's forest, and there's individual trees.

 

[Oxleyroad]

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