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  #1  
Old 14th April 2020, 07:36 AM
JakubV JakubV is offline
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Default Unnamed pyro formula

A formula from Czechoslovak book "Škola fotografie pre začiatočníkov" (A beginner's handbook of photography) published in 1970 (I believe, mine is from '78 as 4th edition).
I don't know anything but basics about pryro devs, but from little that I researched I didn't find this formula anywhere else

Pyrocatechol.........................5g
Metol.....................................5g
Sodium carbonate (anh.).....40g
Sodium sulfite (anh.)............40g
Water to 1l

Recommended times with 1+4 dilution at 18°C
10-13°DIN (ISO 4-16).......5 min
15-18°DIN (ISO 25-50).....7 min
19-21°DIN (ISO 64-100)...10 min

Book states compensating effect and fine grain.
Any thoughts?
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Old 14th April 2020, 09:07 AM
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Let us know your results if you try this formula. It has similar constituents to Pyrocat MC but uses a very small amount of Pyrocatechol.
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Old 14th April 2020, 10:34 AM
Lostlabours Lostlabours is online now
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Foma FV11

Pyrocatechol.........................6g
Metol...................................3g
Sodium carbonate (anh).........45g
Sodium sulphite (anh).....,.......30g
Water to 1 litre

FV 11 1:1; c:a 3 min, 1:3; c:a 8 min, 1:5; c:a 15 min.


Ian
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Old 14th April 2020, 10:35 AM
Mike O'Pray Mike O'Pray is offline
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I am surprised it doesn't cover film speeds beyond ISO 100. Even in 1970 there were films beyond ISO 100. Of course although the book was published in 1970 the formula may be from an era when there were almost no films beyond ISO 100 or the person who gave the formula did not consider it to be the best for anything above ISO 100

Mike
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Old 14th April 2020, 02:31 PM
JakubV JakubV is offline
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Quote:
Originally Posted by Lostlabours View Post
Foma FV11
That's quite close, thanks Ian; do you have experience with this one? Asking so that I'd know what to +- expect from the 'book formula'.

Quote:
Originally Posted by Mike O'Pray View Post
... there were films beyond ISO 100.
Mike
Book doesn't list anything faster than Fomapan 21...I think that it does it intentionaly, as it's recommended for children as young as 10-12 years old, so it wouldn't be overly complex and confusing with choices of fast films and developers for them For example Orwo made a 400 from 1965

Jakub
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Old 15th April 2020, 09:28 AM
Lostlabours Lostlabours is online now
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The book Formula is very close to the Herman Fine Grain Developer.

Herman Fine Grain Developer

Pyrocatechin.........................9g
Metol...................................9g
Sodium carbonate (anh).........60g
Sodium sulphite (anh).....,.......60g
Water to 1 litre

For use dilute 1:9 or 1:19. Diluted 1:19; Efke R100 15 min, diluted 1:9 the time will be approximately 60% of that. Discard working solution after use.

I've given up experimenting with developers, I've been using Pyrocat HD for about 16 years and have no plans to change.

Even on its own Pyrocatechin gives fine grainMimosa a plate, film, and paper manufacturer recommended a two part Fine Grain Pyrocatechin developer.

Ian
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  #7  
Old 17th June 2021, 06:22 PM
Nat Polton Nat Polton is offline
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https://archive.org/details/IlfordBo...ge/n1/mode/2up

The link will take you to an old copy of the Ilford Formula Booklet.
Although Ian has already identified your formula, the Ilford ID-4
is similar and has a few notes that may be of interest.

Also on the site the goes to is the Agfa Formulas booklet.

Cheers.

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