The method of producing sulphide tones has been changed to one of simple re-development with sodium sulphide, the addition of hypo to the sulphide solution having been eliminated. By commencing with thin positive film of the correct density, and using a plain solution of sodium sulphide for re-development, satisfactory transparent tones are obtainable with precision.
The formulas for the iron and uranium tones are the same as in the first edition.
EASTMAN KODAK COMPANY,
Rochester, N. Y.
August, 1918.
FOOTNOTES:
[1] The patent rights to this method are being secured by us, but it may be freely used for toning motion picture film manufactured by the Eastman Kodak Company.
Tinting and Toning of Eastman
Positive Motion Picture
Film
In the production of motion picture film it is becoming more common to vary the color of the film either by toning or tinting or by a combination of the two processes. Toning consists in either wholly or partially replacing the silver image of the positive film by some colored compound, the clear portions or highlights of the image, consisting of plain gelatine, remaining unaffected and colorless. Tinting, on the other hand, consists of immersing the film in a solution of dye which colors the gelatine itself, causing the whole picture on the screen to have a veil of color over it.
Part I.
TINTING
In “tinting” the following factors must be taken into consideration: