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> paterson acuspeed recipe? |
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#11
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Acuspeed Part Two
Having problems, think my images may have too much data. Will try Later.
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#12
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Acuspeed leaflet.
Hopefully these photos may be of some use. For some reason, the Acuspeed column on the previous chart was not printed in bold characters and may not be too clear. If further photos are required just pop a request on here. Cheers. |
#13
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Hi, just out of curiosity i thought i had read this formula in the latest edition of the film developing cookbook (2nd edition).
On page 127 there is 2 potential formulas for Acuspeed (FX20) dated 15th June 1967 from Crawley's notebooks. Code:
Acuspeed (FX20) 15th June 1967 Formula A (g) Formula B (g) Sodium sulfite anhydrous: 70 77.5 Sodium carbonate anh 22.5 25 Sodium metaborate 22.5 25 Glycin 22.5 25 Hydroquinone 12 13.3 Phenidone 1.25 1.4 Sodium bisulfite 1.25 1.4 Potassium hydroxide 10 11 Sodium hydroxide 10 11 Potassium thiosulfate (powder) 5.25 6 Potassium bromide 1.25 4 Water to make 1 litre We have not included the solvents Crawley used so this concentrate may have to be made up at for example 1/2 strength pH between 10.9 and 11 Dilution 1+9 (?) |
#14
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The book .........The Manual of Photography, Focal Press....(Ilford Manual of Photography) has a developer in the appendix that goes by the name of FX-1 High Acutance Developer.
A variant of the Beutler developer for which enhanced adjacency effects, better contrast control and a speed increase of 1/2 - 1 stop are claimed. Not quite the 1 1/2 stops mentioned earlier, but it might lead to something better if googled.
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It will all be over by Christmas. |
#15
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If you regularly need film speeds in excess of ISO 800-1000 then your best friend is Delta 3200.
It's a lovely film- fast, and with a tight crisp grain structure I personally like. If cost is a big issue, and you are loading your own cassettes of something like bulk HP5, then I understand you may not want to keep stocks of a second film. Pushing film is really about underexposing it, and trying to recover an image through modified development. We need to remember that there is a degree of underexposure where the film doesn't register any tone, and extending development can't enhance an image which simply isn't there. The shadows suffer most, but of course you might actually want the high contrast, gritty look of pushed film. |
#16
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Quote:
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#17
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Quote:
Those are extremely bizarre formula, Potassium Thiosulphate in a developer, only in reversal processing. Also at 1+9 there's insufficient Hydroquinone. Crawley wouldn't use Sodium Bisulphite it's an unstable compound only used as a Lab reagent, he would use Sodium Metabisulphite but not with Hydroxide and Metaborate. Sodium Metabisulphite forns Sulphite instantly in the prescence of Hydroxirde or Carbonate. Fiction I fear not facts. Ian |
#18
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Back in the early 1980's I had a discussion with two senior Ilford managers and a research chemist over a business lunch. The chemist had been involved in the scaling up production of Paterson chemistry which was once made for them by Ilford, he commented that often there were unnecessary ingredients in Crawley's formulae and there were no benefits of 3 developing agents.
If you compare this formula you'll see the simplicity of Ilford's Phenidone Glycin developer compared to the examples above. Ilford "Phenidone Glycin" Developer Patent Formula (Ilfosol) Phenidone 1.75g Glycin 50g Potassium Sulphite (anhyd) 297g Potassium Hydroxide13.4g (to pH 9.9 Water to 1 litre Use 1+7 (same as Acuspeed) Crawley FX-11 (Crawley's published Speed increasing developer) Phenidone 0.25g Hydroquinone 5g Glycin 1.5g Sodium Sulphite (anhyd) 125g Borax 2.5g Potassium Bromide 0.5g Water to 1 litre Use Full Strength This can’t be made up as a concentrate due to the high level of Sodium Sulphite, Ilford use Potassium Sulphite as it has higher solubility. Ian |
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