The Dictionary Of Photography

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

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Development and Developers
Rodinal ...        ...        ... ...        ...        ... 1 part.
Water ................... 30 to 40 parts.
The most advantageous temperature for the developing-solution is 150 C. (= 590 Fahr.). The temperature should not exceed 2ooC. (=68o Fahr.).
Rodinal-Hydrokinone Developer. This combines the effect of detail characterising rodinal together with the density given by hydrokinone.
A.
Sodium sulphite, cryst. Water Citric Acid Potassium bromide Hydrokinone
B.
Potassium carbonate (pearlash)
Water
Rodinal ...
I oz.
20 ozs
... 5 grs.
... 60 ..
... 120 ..
2 ozs
... 20 ..
I ..
For soft.negatives (portraits, etc.) take equal parts of A, B and water. For brilliant negatives take equal parts of A and B.
For detail increase the quantity of B. For density increase the quantity of A.
The Synthol Developer. Synthol is characterised by clean development, and as this does not require the presence of an alkali there is no corrosive action on the film.
Normal Synthol Developer.
Synthol..................30 grs.
Crystallised sulphite of soda ...        ...        ... 150 ..
Water.................. 3^ ozs.
When the exposure is unknown, the following routine may be desirable: -
Normal synthol developer is diluted with about an equal bulk of water, and poured on the plate. If the image flashes up quickly so as to indicate over-exposure, the solution is poured off at once, and the plate is rinsed, after which the same de-veloper to which bromide of potassium has been added is poured on ; the amount of bromide being from half a grain per ounce of liquid to several grains.
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