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Clayton Phenidone - 1 Lb.

B&H# CLPLB
Mfr#
98 4710

Price: $ 58.50

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Features
Specifications

Phenidone is used as a low toxic common photography developer. It is sparingly soluble in cold water and moderately in hot, and can require temperatures of 175°F/80°C to dissolve.

Phenidone can be substituted for metol. There is evidence that as a substitute for metol it causes true increase in film speed. However, Phenidone should not be used as a substitute in developers in which metol is the sole developing agent, such as Kodak D-23 and D-25. Try substituting approximately 10% of the amount of Phenidone for the amount of metol required.

: • Readily soluble in both aqueous acids and alkalies, including solutions of alkali bisulfites and carbonates, so that it can easily be incorporated into a developer solution.

: • Used alone in sodium carbonate/sulfite solutions, it is very fast but extremely soft working and is only capable of producing negatives of low contrast. In combination with hydroquinone it produces developers with super-additivity that are even more efficient then MQ developers.

: • Phenidone-based developers keep better then those based on metol the reason for that is that the oxidation product of phenidone is more efficiently regenerated by hydroquinone than is metol.

: • Additionally, while the first oxidation product of hydroquinone, monosulphonate, forms an almost inert system with metol, it has a super-additive effect with phenidone, increasing developing powder.

• Because very small amounts of Phenidone are required, it is often desirable to use a percentage solution. a concentrate of Phenidone, containing a preservative, can be made as follows:

Water(125°F/52°C)	24 oz	750 ml
Sodium bisulfite	90 grains	6 grams
Phenidone	30 grains	2 grames
Cold water to make	32 oz	1 liter

: • For use, 100 ml of concentrate contains 0.2 grams of Phenidone. The preservative will have no appreciable effect on any developing formula.
Alternately, a 5% concentration can be made using methyl hydrate instead of water, but it does not keep. Use immediately.

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Clayton Phenidone - 1 Lb.

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