Support our Sponsors, they keep FADU free:   AG Photographic   Keyphoto   The Imaging Warehouse   Process Supplies   RH Designs   RK Photo   Second-hand Darkroom Supplies   Silverprint Ltd

Notices

Go Back   Film and Darkroom User > Chemistry > Chemical formulae

  ***   Click here for the FADU 2015/2014 Yearbooks   ***

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 6th March 2020, 09:24 AM
Nat Polton Nat Polton is offline
Friend
 
Join Date: Oct 2019
Posts: 276
Default Acuspeed Part Two

Having problems, think my images may have too much data. Will try Later.
Reply With Quote
  #12  
Old 6th March 2020, 07:36 PM
Nat Polton Nat Polton is offline
Friend
 
Join Date: Oct 2019
Posts: 276
Default Acuspeed leaflet.

Click image for larger version

Name:	ACUSPEED A.JPG
Views:	39
Size:	126.0 KB
ID:	3660

Click image for larger version

Name:	ACUSPEED B.JPG
Views:	32
Size:	127.2 KB
ID:	3661

Click image for larger version

Name:	ACUSPEED C.JPG
Views:	28
Size:	143.0 KB
ID:	3662

Click image for larger version

Name:	ACUSPEED D.JPG
Views:	25
Size:	136.6 KB
ID:	3663


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.
Reply With Quote
  #13  
Old 7th March 2020, 03:54 PM
Ami H Ami H is offline
New User
 
Join Date: Jul 2016
Location: UK, Near Leeds
Posts: 1
Default

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 (?)
Reply With Quote
  #14  
Old 20th July 2020, 07:24 PM
Nat Polton Nat Polton is offline
Friend
 
Join Date: Oct 2019
Posts: 276
Default

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.
__________________
It will all be over by Christmas.
Reply With Quote
  #15  
Old 24th July 2020, 07:04 AM
skellum's Avatar
skellum skellum is offline
Friend
 
Join Date: Dec 2011
Location: Isle of Lewis
Posts: 1,022
Default

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.
Reply With Quote
  #16  
Old 25th July 2020, 12:55 AM
Bob's Avatar
Bob Bob is offline
Administrator
 
Join Date: Aug 2008
Location: London
Posts: 2,262
Default

Quote:
Originally Posted by Ami H View Post
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 (?)
Ah - glycin. Unfortunately I think the the Photographer's Formulary in the US is the only source these days
Reply With Quote
  #17  
Old 25th July 2020, 08:07 AM
Lostlabours Lostlabours is offline
Friend
 
Join Date: Apr 2012
Location: West Midlands/Aegean
Posts: 1,613
Default

Quote:
Originally Posted by Ami H View Post
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 (?)

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
Reply With Quote
  #18  
Old 25th July 2020, 11:58 AM
Lostlabours Lostlabours is offline
Friend
 
Join Date: Apr 2012
Location: West Midlands/Aegean
Posts: 1,613
Default

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
Reply With Quote
Reply
Support our Sponsors, they keep FADU free:   AG Photographic   Keyphoto   The Imaging Warehouse   Process Supplies   RH Designs   RK Photo   Second-hand Darkroom Supplies   Silverprint Ltd

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Spotone and Adams Recipe for Spotting B&W Nat Polton Darkroom 17 19th January 2020 07:34 PM
I don't use Paterson reels Anon01 Darkroom 18 17th November 2019 01:43 PM
Paterson changing bag for LF? Miha Equipment miscellaneous 15 2nd December 2015 03:58 PM
ILFORD Perceptol preparation recipe went wrong pietro Darkroom 3 5th January 2015 09:01 PM
Paterson Orbital. CambsIan Equipment miscellaneous 10 7th July 2013 07:05 AM


All times are GMT. The time now is 06:34 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.