Tinting and toning of Eastman positive motion picture film

by Eastman Kodak Company

Tone F

Tone F (Sulphide)

Positive Employed

With a thin positive a warm brown tone is obtained, while with denser film the effect is that of a blue-black tone.

		Avoirdupois		Metric
A.	Potassium Ferricyanide	8	lbs. 5 ozs.	4000	grams
	Potassium Bromide	2	lbs. 2 ozs.	1000	grams
	Water to	50	gals.	200	liters
B.	Sodium Sulphide (crystal)	2	lbs. 2 ozs.	1000	grams
	Water to	50	gals.	200	liters

A trace of iron in the sodium sulphide will do no harm providing the solution is boiled and the precipitated iron sulphide allowed to settle before use. The well washed positive is thoroughly bleached in A, washed for 5 minutes, and immersed in solution B until the film is thoroughly toned.

Temperature of Toning—65 degrees to 70 degrees F.

Time of Toning—Four to five minutes.

Time of Washing—Ten to fifteen minutes.

Life of Baths

The toning baths A and B are comparatively stable and will keep until exhausted.