The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Development and Developers
Development with Pyrogallic. Any of the following developers are suitable for most plates or films: -
Pyro and Ammonia Developer. No. i. Pyrogallic acid ... Citric acid Water .. ... ... ... __
No. 2.
Strong ammonia (*88o) ...        ...        ...        I oz.
Bromide of potassium ... ...        ...        ...    120 grs.
Distilled water... ... ...        ...        ...        7 ozs.
The above will keep good for months if well corked. For use dilute 1 part No. 1 with 19 parts of water, and in another bottle 1 part No. 2 with 19 parts of water. The dilute solutions should be made fresh every day. To develop a correctly exposed plate or film, mix equal parts of these two solutions. In hot weather, when making up the dilute solutions for use, add 4 parts of No. 1 to 3 parts of No. 2, instead of equal.parts of Nos. 1 and 2. In no case should the quantity of No. 2 exceed that of No. I.
Pyro and Soda Developer with Metabisulphite.
No. 1.
Pyrogallic acid ... ... ... ...        ... 1 oz.
Metabisulphite of soda          ...        ...        ...        1 ..
Water ... ... ... ... ... ... 80 ozs..
Dissolve the metabisulphite, and then add the pyro.
No. 2.
Crystallised carbonate of soda (washing soda) 12 ozs. Water.................. 80 ..
No. 3.
Bromide of potassium ...        ...        ...        ...        I oz.
Water ... ... ... ... ... ... 9 ozs.
To develop, mix equal parts of Nos. 1 and 2. When working in the summer time in a good light, with full exposure, add 5 minims of No. 3 to each ounce of developer (or, to save the trouble of measuring small quantities,of No. 3 may be
added to the 80 ozs. of No. 2); in winter the bromide may
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