Tinting and toning of Eastman positive motion picture film

Price $2.50 Second Edition—Revised
Eastman Kodak Company Rochester, N. Y. 1918
Owing to the difficulty of obtaining foreign made dyes, a revision of the first edition of this publication has been made necessary.
As the result of an exhaustive series of tests of the products of the National Aniline & Chemical Company, Incorporated, New York City, it is now possible to recommend a number of American made dyes suitable for the tinting of motion picture film, and those recommended in this book are in most cases equal in every respect to those previously obtained abroad.
To date, it has not been possible to obtain a thoroughly satisfactory blue dye, film tinted with the Cine Blue recommended being too red, especially before drying. A more suitable dye will no doubt be available in due course.
The number of sample tints has been curtailed to twelve, and these are given merely for guidance. It is intended that the various formulas should be altered to suit individual requirements.
The chapter on toning has been thoroughly revised, a number of tones having been eliminated and others substituted. The formula for the copper tone has been improved, while the formulas for green tones requiring the use of vanadium chloride have been eliminated in view of the expense and difficulty of obtaining satisfactory vanadium chloride. With the samples at present on the market it has not been possible to prepare a single-solution toning bath which would keep for any reasonable length of time.
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.