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Old 19th February 2009, 03:38 PM
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Default Microphen Formula

Similarly obtained, here is Microphen formula:
Sodium Tripolyphosphate 3.4 gms
Sodium Sulphite anhyd 100.0gms
Sodium Metabisulphite 0.65 gm
Hydroquinone 5.0 gms
Phenidone 0.2 gm
Boric Acid 2.7 gms
Borax 6.8 gms
Potassium Bromide 1.0 gm
Water to make 1 Litre
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Old 14th March 2009, 03:34 PM
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This is an Ilford PQ version of ID-11. There were a number of these published from 1954 to the mid 60's. Ilford did research into improving ID-11, in a similar way to Kodak's variations of D76 in the late 30's and early 40's, essentially varying the buffering.

Some of these appear to have been manufactured for testing in large photofinishing labs but they were not Microphen. Other Iford documents make this quite clear.

Mac
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Old 15th March 2009, 08:43 AM
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Whilst this may not be Microphen as sold by Ilford, I've used it and it works exactly the same as Microphen. I used a slightly simplified version without the tripolyphosphate or the metabisulphate. It seemed to work OK, but I'd love to know what they are supposed to do. I suspect it has to do with keeping qualities(?)

Rob
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Old 15th March 2009, 01:15 PM
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ID-68 is stated by Ian Grant to be similar to Microphen:

http://www.lostlabours.co.uk/photography/devID68.htm

Phenidone 0.13 g
Sodium Sulphite (anh) 85 g
Hydroquinone 8 g
Potassium Bromide 1 g
Borax 7 g
Boric Acid 2 g
Water to 1 litre
To use: FS, 1+1, 1+3

Tom.
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Old 15th March 2009, 08:13 PM
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Quote:
Originally Posted by Tom Kershaw View Post
ID-68 is stated by Ian Grant to be similar to Microphen:

http://www.lostlabours.co.uk/photography/devID68.htm

Phenidone 0.13 g
Sodium Sulphite (anh) 85 g
Hydroquinone 8 g
Potassium Bromide 1 g
Borax 7 g
Boric Acid 2 g
Water to 1 litre
To use: FS, 1+1, 1+3

Tom.
That's exactly as I used it (except I think I used 100g Sodium Sulphite) and it's good - gave me just what I would have expected from Moicrophen.

Rob
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Old 15th March 2009, 08:50 PM
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Metabisulphite is added to Part A in some powdered developer to help prevent oxidation of the Developing agents, Ilford use it in some of their powdered PQ developers.

It requires an increase in the alkali to compensate for the acidity of the Metabisulphite which is easy in Bromophen which includes Carbonate in Part B, but in the developer posted here it requires an increase in pH Buffering instead.

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