For local tinting and hand coloring, the above dyes are likewise satisfactory.
Troubles in Tinting
Streaks and Uneven Coloring
Cause
a. Grease on the film. Never project film before tinting.
b. Slight bleeding and insufficient squeegeeing when on the drying rack. Always carefully remove any surface moisture from the film with a damp chamois, before drying.
Sludge in the Dye-bath
This is due to the precipitation of the dye by small traces of alum or iron in the water supply. In many localities water is purified by adding alum, and only the smallest trace need be present to throw some of the dye out of solution.
Frothing of the Dye-bath
This occurs only when tinting on the drum with Cine Scarlet, Cine Orange, and Cine Green, but no inconvenience will be caused if the drum is revolved slowly.