Developers for plates

“Pyro-Soda.”

Stock Solution.
Metabisulphite of Potass.50 grs.10 grms.
Pyrogallic Acid1 oz.83 grms.
Bromide of Potassium60 grs.13 grms.
Water (boiled or distilled) to12 oz.1.000 c.c.
No. 1.
Stock Solution3 oz.150 c.c.
Water (boiled or distilled) to20 oz.1.000 c.c.
No. 2.
Soda Sulphite (Cryst.)2 oz.100 c.c.
Soda Carbonate2 oz.100 c.c.
Water (boiled or distilled) to20 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 Scalol45 grs.5 grms.
Metabilsulphite of Potass.120 grs.14 grms.
Pyrogallic Acid55 grs.6 grms.
Water (boiled or distilled) to20 oz.1.000 c.c.
No. 2.
Soda Carbonate (Cryst.)4 oz.200 grms.
Water (boiled or distilled) to20 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.

Hypo1 lb.
Potass. Metabisulphite2 oz.
Water50 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