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Developers for plates

“Pyro-Soda.”

Stock Solution.
Metabisulphite of Potass. 50 grs. 10 grms.
Pyrogallic Acid 1 oz. 83 grms.
Bromide of Potassium 60 grs. 13 grms.
Water (boiled or distilled) to 12 oz. 1.000 c.c.
No. 1.
Stock Solution 3 oz. 150 c.c.
Water (boiled or distilled) to 20 oz. 1.000 c.c.
No. 2.
Soda Sulphite (Cryst.) 2 oz. 100 c.c.
Soda Carbonate 2 oz. 100 c.c.
Water (boiled or distilled) to 20 oz. 1.000 c.c.

For use take equal quantities of No. 1 and 2. For under-exposure use more of No. 2. For over-exposure more of No. 1.

“Standard.”

No. 1.
Metol, Monomet or Scalol 45 grs. 5 grms.
Metabilsulphite of Potass. 120 grs. 14 grms.
Pyrogallic Acid 55 grs. 6 grms.
Water (boiled or distilled) to 20 oz. 1.000 c.c.
No. 2.
Soda Carbonate (Cryst.) 4 oz. 200 grms.
Water (boiled or distilled) to 20 oz. 1.000 c.c.

For use take equal quentities of No. 1 and 2.

The “Pyro-Soda” developer should be used for correct and full exposures; the “Standard” developer is specially suitable for snapshots generally and under-exposures.

Dissolve the chemicals in the order given. Both developers keep indefinitely.

The English and French measures are not equivalents, but the proportions are the same.

Acid Fixing Solution.

Hypo 1 lb.
Potass. Metabisulphite 2 oz.
Water 50 oz.

Note.—A plain fixing solution may be used if preferred; in that case leave out the Metabisulphite.

The Imperial Dry Plate Co., Ltd., Cricklewood, London, N.W. 2

Spec Rapid 16121B

Examined by HC