The chemicals employed should be pure (for the samples, “EKCo.” tested chemicals were used), and in cases where a good water supply is not available, only distilled water should be used.
Troubles in Toning
Most difficulties met with in toning may be traced to one or more of the following causes:
Uneven Toning
This may be due to:
a. Grease on the film. Never project film before tinting or toning.
b. Drying spots on untoned film. If possible, always tint or tone film immediately after washing and before drying.
c. Examination of the film too frequently during toning, causes an oxidation of the toning solution in places where the solution fails to drain from the film.
d. Insufficient or uneven washing of the film after bleaching and before toning (Tones F and G).
White Spots