|Molar mass||162.19 g·mol−1|
|Appearance||Crystal leaflets or needles|
|Melting point||121 °C (250 °F; 394 K)|
|10 g/100 ml at 100 °C|
|Solubility in ethanol||10 g/100 ml (hot)|
|Solubility in diethyl ether||practically insoluble|
|Main hazards||Harmful if swallowed|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Phenidone (1-phenyl-3-pyrazolidinone) is an organic compound that is primarily used as a photographic developer. It has five to ten times the developing power as Metol. It also has low toxicity and, unlike some other developers, does not cause dermatitis upon skin contact.
Phenidone is Ilford's trademark for this material, which was first prepared in 1890. It was not until 1940 that J. D. Kendall, in the laboratories of Ilford Limited, discovered the reducing properties of this compound. Large scale production did not become feasible until 1951.
Phenidone functions as a reducing agent. It converts to the N-phenyl-hydroxypyrazole:
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