The Dictionary Of Photography

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

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Hydroquinone
Quinol..................        i grs.
Ammonium carbonate .. ... ...      24 M
,, bromide ... ... ... ... ..
Distilled water... ... ... ... ...        1 oz.
Mix immediately before using. As a convenience for travelling, the following dry powder developer will be found simple and convenient: -
I. Quinol           ... ... ... ...... 90 grs.
II. Sodium sulphite (granular)           ...... 2 ozs.
III. Carbonate of soda {dried) ... ... ... 1 oz.
Wrap each salt in waxed paper and tinfoil. Dissolve these quantities in a quart of water. As a further convenience they may be subdivided into four or eight packets each, so as to make sufficient quantities for 10 or 5 ozs. of developer. Although a one-solution developer is not the best form, it may be found con-venient for travelling, and then the following mixture will answer wrell: -
Quinol ... ...        ...        ... ...    90 grs.
Sodium sulphite (cryst.)    ...        ... ...      2 ozs.
Carbonate of soda ...        ...        ... ...      2 ,,
Distilled water to make     ... ......     10 ..
This solution will keep at least two months, and when required for use should be diluted with four times the quantity of water. For over-exposure use old developer, for under-exposure new developer, and for normal half old and half new. In using quinol as a developer several precautions are necessary. Absolutely clean dishes must be used, as any trace of pyro produces a brown stain. For negative work fresh developer should be used for each plate ; but the used developer may be kept and used for bromide paper and transparencies. Both negatives and posi-tives should be well washed after development prior to fixing; and if either of the caustic hydrates of the alkalies are used, then an alum bath should be used after development to prevent frilling. All plates and papers developed by quinol require clearing and
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