|Jmol-3D images||Image 1|
|Molar mass||162.19 g mol−1|
|Appearance||Crystal leaflets or needles|
|Melting point||121 °C (250 °F; 394 K)|
|Solubility in water||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 are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
Phenidone (1-phenyl-3-pyrazolidinone) is an organic chemical compound whose primary use is 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 Dr. J. D. Kendall, in the laboratories of Ilford Limited, discovered the photographic reducing properties of this chemical. However, large scale manufacturing of the compound did not become feasible until 1951.
- Merck Index of Chemicals and Drugs, 9th ed. monograph 7115
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