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_ APPENDIX
wash in running water for at least 15 minutes and place in the regular developer for from 3 to 5 minutes, after which it should be washed again for 30 minutes.
REDUCTION OF MOTION PICTURE NEGATIVES
Persulphate Reducer
This formula is advised, where the film is very contrasty for it has the faculty of reducing the dense portions of the negatives without any material change in the high lights or thinner portions. Place the wet film in solution No. 1 which is made up of :
Water 100 gals.
Persulphate of ammonium 33*4 lbs.
As soon as the right density has been obtained place the film in solution No. 2 which consists of :
Sulphite soda 10 lbs.
Water 100 gals.
This will stop the reduction immediately after which film should be washed for from 15 to 20 minutes in running water and then dried as usual.
Ferrichloride Reducer
This is an efficient method of reduction. It has been found of particular value in reducing high lights at a greater speed than shadows thereby overcoming extreme contrast.
Ferrichloride 1 dr.
Hydrochloric acid 2 dr.
Water 10 oz.
The negative to be reduced is first thoroughly washed until the last traces of hypo are eliminated. It is then immersed in the reducer for a minute or so. On taking the negative out from this solution, no action will be apparent, but on transferring it to a freshly mixed hypo bath, reduction will take place very quickly. The operation should be carefully watched, being stopped a little short of completion.
Ferricyanide or Farmer's Reducer
This reducer acts differently than those given above as it increases contrast by attacking the shadows more than the high
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