Collecting and sharing black and white analog photographic formulas
Formulas contribution over time
We must caution you regarding safety. It is advisable whenever one is mixing chemistry to take proper precautions. Always use protective gear (goggles, gloves, apron, etc.). Always be certain to work in a well ventilated area. Always have extinguishing devices at hand in the event of an emergency. Always have an escape plan if the need for a rapid exit becomes necessary. Keep an MSDS for all chemicals present as this will not only be useful in medical assistance but also for emergency responders in the case that something were to happen.
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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
Use undiluted Ingredient Quantity Mix chemicals in order. Sodium sulfite, desiccated 12.5 grams Glycin 2 grams Potassium carbonate 25 grams Water to make 1 liter Develop medium speed films from 10 to 12 minutes at °20 C.
When the developer is prepared with tap water, the solution usually appears cloudy, which fact is due to the lime salts of the water combining with alkali and forming a precipitate. This turbidity has no effect on the properties of the developer, but if the lime content of the water is high, it may result in an unpleasant deposit on the surface of the film.
Positive developer. When a brown-tone developer of this type is used, it does not mean that brown tones will be produced on any paper; not all papers are suitable for brown tones. This developer should be used for those papers which are especially designed to produce brown tones, as will be indicated on the label or instruction leaflet.