The Ilford PQ variants of ID-11 (D76)

The Ilford PQ variants of ID-11 (D76)

  1. Ian Grant
    Most of the MQ variations of D76 are published widely, but less is known about the PQ variants of Ilford's equivalent developer ID-11

    Although J.D. Kendall of Ilford discovered and patented Phenidone (1-Phenyl-3-Pyrazolidone) in 1941 it was 11...
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