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Old 24th October 2015, 11:03 AM
Lostlabours Lostlabours is offline
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Default Autophen

Quote:
Originally Posted by Rob Archer View Post
The formula I use for microphen is the one from The Darkroom Cookbook (#21) which is described as 'microphen-type'. I use the times given for Ilford Microphen and find it works fine. My personal taste is for a slightly higher contrast negative so I usually develop for 10% above the published times. The formula:

Water 52°C. 750ml
Sodium Sulphite (anh)100g
Hydroquinone 5g
Borax 3g
Boric acid 3.5g
Potassium bromide 1g
Phenidone 0.2g
Cold water to 1litre

This is now my standard developer for faster films.
That's the published formula for Autophen, Steve Anchell corrected it in the 3rd Edition of The DCB along with a large number of other errors.

In the 1950's Ilford Research release a number of article in the BJP relating to the evolution of Autophen and it's replenishment and naming the above formula as Autophen.

Shortly after they released Microphen, and published ID-68, stating this was an entirely new developer. By reducing the Sulphite to 80g per litre as well as using Phenidone Microphen/ID-68 gives a speed increase compared to ID-11(D76) and Autophen.

Microphen is closer to being a PQ version of Adox Borax MQ or Agfa 44 (Agfa Ansco 17) both ofnwhich give a slight 1/3 stop speed increase compared to ID-11, Microphen is more like 2/3 stop speed increase.

Ian
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