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> Microphen Formula |
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#1
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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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Computerised and Slightly DIGITISED but FILM still RULES with ME ! |
#2
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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 |
#3
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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 |
#4
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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. |
#5
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Quote:
Rob |
#6
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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. Mac |
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