from The Century Dictionary.

  • noun The trade-name of the sodium salt of amido-β- naphthol-monosulphonic acid, used in photography as a developer.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Photog. & Chem.) The sodium salt of a sulphonic acid of a naphthol, C10H5(OH)(NH2)SO3Na used as a developer.


Sorry, no etymologies found.


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  • Probably the best of all is "pyro," but the fact that it stains the fingers is a serious objection to it for amateur use, and almost any other developer, such as metol, eikonogen or hydroquinon will be better.

    Outdoor Sports and Games Claude H. Miller

  • Pulverize the eikonogen, add the water and, at the same time, the material on its removal from the printing frame, and keep in motion until the development is effected.

    Photographic Reproduction Processes Peter C. Duchochois

  • "Then you have no prejudices as to which is the best developer, pyrogallic acid or ferrous oxalate, not to mention such recent decoctions as eikonogen, quinol, and others?"

    One Day's Courtship Robert Barr 1881


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