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ID-68 Ilford "PQ Fine Grain" Developer
| Sodium Sulphite (anh) | 85 g | |
| Hydroquinone | 5 g | |
| Borax | 7 g | |
| Boric Acid | 2 g | |
| Poassium Bromide | 1 g | |
| Phenidone | 0.13 g | |
| Water to | 1 litre |
To use: FS, 1+1, 1+3
Ilford state this formula is similar to Microphen.
ID-68R Replenisher
| Sodium Sulphite (anh) | 85 g | |
| Hydroquinone | 8 g | |
| Borax | 10 g | |
| Phenidone | 0.22 g | |
| Water to | 1 litre |
Only FS ID-68 can be Replenished.
There were a number of Ilford PQ variations
of ID-11, some have been erroneously assumed in US publications
to be Microphen, although there will be some close
similarities. However after commercial trials of the PQ version of ID-11
in the late 1950's Ilford decided to retain ID-11 as an MQ developer,
and instead introduced two new PQ Fine Grain Developers, Autophen
for Photofinishing laboratories based on this research, and Microphen,
which was a re-formulation of the PQ Fine Grain deveveloper, with reduced
Sulphite, and a different balance of Phenidone and Hydroquinone to improve
the developer's characteristics and performance. When Ilford released
Microphen they made clear in various publications that
it was a new type of developer.