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Photographers' Formulary Amidol - 10 Grams

B&H # PHA10G Mfr # 10-0040 10G
Usually ships in 2-4 weeks

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This is a special order item and is non-cancelable and non-returnable. Est. arrival at B&H is 2-4 weeks (subject to availability). Your order will be charged at time of shipment.

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For international orders, credit cards will be charged at time you place your order.

You Pay: $7.95

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Photographer's Formulary Amidol Developer is regarded as one of the finest developers available. It produces rich, strong, black tones which are slightly cool.

Although amidol is an excellent developer, it has a number of drawbacks. It is toxic and expensive. It does not keep well in solution. (Its useful life is about 2-3 hours.) And because amidol stains everything it comes into contact with, it is not pleasant to work with. Formulary Amidol Paper Developer is very similar to Formulary Edward Weston's Paper Developer (Catalog number 02- 0010).

Weston's amidol developer contains citric acid and more restrainer (potassium bromide) than does Formulary Amidol Paper Developer. The additional restrainer in Weston's Amidol Developer results in prints with greater contrast. Because Formulary Amidol Paper Developer is not acidic, it is a more vigorous developer than is Weston's Amidol.

Caution: Amidol is a poison and must be used with caution. It is probably absorbed through the skin so the use of tongs or disposable rubber gloves is recommended when working with amidol solutions.

Amidol stains. Staining is due to the air oxidation of the free base of amidol which is present in neutral or basic solution. Soap, for example, is sufficiently alkaline to cause the amidol hydrochloride salt to be converted to the free base which will then oxidize rapidly forming the staining products.

In cleaning a darkroom after amidol use, first wash with water (amidol is very water-soluble) and then wash with a 2% solution of hydrochloric acid.

The acid wash ensures that the amidol remains in the salt form. Once amidol has been oxidized and has stained, there is not much that can be done.

If an amidol solution should be spilled on the skin, wash the area first with water, then a 2% solution of hydrochloric acid, and finally with soap and water.

Amidol works best on bromide paper where it produces a pleasing tonal range.
It can be used at high dilution and yet maintain good print color
Soft- high key prints are especially beautiful when processed in a diluted amidol developer
Because of its unique developing qualities, amidol is the favorite developer of photographers who exhibit their prints
Synonyms Diaminophenol
2,4 Diaminophenol dihydrochloride
Acrol
Dianol
Appearance Fine white or bluish gray crystals
Uses A rapidly working developer requiring only sulfite as an accelerator. Primarily used for printing, but occasionally for negatives. Oxidizes rapidly and keeps poorly
Chemical Formula C6H8N2O.2HCL
Notes Amidol is very soluble in water or sulfite though it deteriorates rapidly in solution. The keeping properties of amidol in solution can be improved by the addition of a weak acid, such as lactic acid. Amidol is energized by sodium sulfite alone, without the necessity of adding any alkali.

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