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.
Attention is drawn to the new method of dye toning[1] recently worked
out in our Research Laboratory. This consists in first treating the
film in the copper toning bath and then immersing the washed film in
a solution of a basic dye, the dye attaching itself to the image and
leaving the gelatine clear. Although specific directions are given
for obtaining five tones only by this method, as further dyes are
available, those suitable for toning purposes will be published in
due course.
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.