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
  #1  
Old 14th April 2020, 07:36 AM
JakubV JakubV is offline
Friend
 
Join Date: Jul 2018
Location: Bratislava, Slovakia
Posts: 86
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?
Reply With Quote
  #2  
Old 14th April 2020, 09:07 AM
Barry's Avatar
Barry Barry is offline
Administrator
 
Join Date: Aug 2008
Location: Mendip Hills, Somerset
Posts: 2,341
Default

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.
__________________
Cheers, Barry
Reply With Quote
  #3  
Old 14th April 2020, 10:34 AM
Lostlabours Lostlabours is offline
Friend
 
Join Date: Apr 2012
Location: West Midlands/Aegean
Posts: 1,719
Default

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
Reply With Quote
  #4  
Old 14th April 2020, 10:35 AM
Mike O'Pray Mike O'Pray is online now
Friend
 
Join Date: Oct 2008
Location: Daventry, Northants
Posts: 8,126
Default

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
Reply With Quote
  #5  
Old 14th April 2020, 02:31 PM
JakubV JakubV is offline
Friend
 
Join Date: Jul 2018
Location: Bratislava, Slovakia
Posts: 86
Default

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
Reply With Quote
  #6  
Old 15th April 2020, 09:28 AM
Lostlabours Lostlabours is offline
Friend
 
Join Date: Apr 2012
Location: West Midlands/Aegean
Posts: 1,719
Default

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
Reply With Quote
  #7  
Old 17th June 2021, 06:22 PM
Nat Polton Nat Polton is offline
Friend
 
Join Date: Oct 2019
Posts: 459
Default

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.

Cheers.
__________________
It will all be over by Christmas.
Reply With Quote
Reply

Tags
formula, pyro
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
Perceptol Formula pentaxpete Chemical formulae 49 25th December 2018 06:29 PM
Pyro film, pyro paper developer then? jfmatias Monochrome Film 7 26th July 2011 03:57 PM
Microphen Formula pentaxpete Chemical formulae 5 15th March 2009 07:50 PM
My RC paper dev formula pentaxpete Chemical formulae 1 14th March 2009 02:23 PM
Beers Formula Barry Chemical formulae 6 26th January 2009 03:57 PM


All times are GMT. The time now is 02:20 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.