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