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The above list of dyes has been selected after testing more than five hundred dye samples, but is necessarily incomplete because new dyes have appeared on the market since these tests were made.
The Eastman Kodak Company is anxious to recommend satisfactory tinting dyes so that if manufacturers will submit samples of new dyes to the Research Laboratory, Eastman Kodak Company, Rochester, New York, they will be carefully tested with a view to recommending those suitable for film tinting.
In cases where alternative dyes have been recommended, they may differ slightly in regard to color, rate of bleeding, etc., and are therefore not strictly interchangeable. This is due to different methods of manufacture. In the following formulae the first dyes indicated on the above list were used.
The strength of the dyes may vary from batch to batch, the same dyes made by different makers differing particularly in this respect, so that when purchasing it is desirable to secure a statement of the percentage of pure dye in the sample. As stated above, a certain percentage of salt or sodium sulphate is present in most commercial dyes, so that when comparing prices the amount of impurity present should be taken into consideration.
Formulae for Tinting at 65° (F).
TIME OF
NO.
DYE
AVOIRDUPOIS
METRIC
TINTING
1
2 lbs.
1000 grams
3 minutes
Water
50 gals.
200 liters
2
400 grams
3 minutes
Water
.... 50 gals. 26 ozs.
200 liters
3
Cine Scarlet . . .
800 grams
3 minutes
Water
.... 50 gals.
200 liters
4
Cine Scarlet . .
400 grams
3 minutes
50 gals.
200 liters
5
18 ozs.
540 grams
3 minutes
Cine Scarlet . .
1 oz. 150 grains
40 grams
50 gals.
200 liters
6
Cine Yellow . .
18 ozs.
540 grams
3 minutes
Cine Scarlet . .
1 oz. 150 grains
40 grams
Water
50 gals.
200 liters
7
400 grams
3 minutes
Water
50 gals.
200 liters
8
Cine Lt. Green
26 ozs.
800 grams
3 minutes
Water
50 gals.
200 liters
9
Cine Green ....
26 ozs.
800 grams
3 minutes
Water
, ,..50 gals.
200 liters
10
Cine Blue
. .... 13 ozs.
400 grams
3 minutes
50 gals.
200 liters
11
Cine Blue
13 ozs.
400 srams
1 minute
Water
, .,50 gals.
200 liters
12
Cine Violet
13 ozs.
400 srams
3 minutes
Water
50 gals.
200 liters
Method of Preparing the Dye Solution
Dissolve the solid dyes in as small an amount of hot water as possible, and filter through fine muslin. Pour hot water over any residue remaining to insure thorough solution of the dye. and
50