R110 Film Developer

Supposedly soft working phenidone, hydroquinone developer yielding nice mid tones akin to D-23 by Jay DeFehr.


Mix chemicals in the listed order. Make sure each chemical is completely dissolved before mixing the next one. Use distilled or deionized water for improved keeping properties.


Chemical Amount
Water (50 °C) 750 ml
Sodium sulfite 85 g
Hydroquinone 1 g
Borax 1 g
Potassium bromide 1 g
Phenidone1 100 mg
Water to make 1000 ml

Replenisher R110R

Chemical Amount
Water (50 °C) 750 ml
Hydroquinone 1.6 g
Borax 1.25 g
Phenidone1 200 mg
Water to make 1000 ml


The developer is replenish-able and should be used undiluted. Starting development time is in the 5 to 6 minute range at 20 °C. Replenish 70 ml per roll of film.



Measuring small quantities of phenidone, see Phenidone Solution

Date: 2022-11-21