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

Notices

Go Back   Film and Darkroom User > Chemistry > Toning

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

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 25th October 2020, 01:19 PM
David Lingham's Avatar
David Lingham David Lingham is offline
Friend
 
Join Date: Dec 2008
Location: cardiff
Posts: 460
Default

Terry

Controlling sepia toning is down to the ratio of thiourea to sodium hydroxide in the toning bath, and the depth of bleaching. For a proprietary brand of sepia toner I would start by diluting the bleach to a third of the suggested strength. For the toning bath, the ratio for a warm toned image is 5-1(thiourea to sodium hydroxide), a mid tone would be equal amounts of each (thiourea to sodium hydroxide), and for dark brown 1-5 (thiourea to sodium hydroxide).

In practice, for a warm tone print, add 50mls of the thiourea concentrate and 10mls of the sodium hydroxide to 1 litre of water. I have found keeping the toning bath warm at around 25degrees helps with the depth and warmth of the tone. I would suggest the example you gave on Wolfgang Moersch’s site, has been bleached into the midtones and toned using a 5-1 mix. Warm toned papers such as MGWT will also give a greater response with sepia toning.

If you are interested, there is a short article about sepia toning on my website, under the heading information.
__________________
David Lingham

www.davidlingham.uk
Reply With Quote
  #12  
Old 25th October 2020, 01:37 PM
Terry S Terry S is offline
Friend
 
Join Date: Dec 2011
Location: Southend on Sea, Essex, England, UK
Posts: 3,795
Default

Thanks for the info David and I have just read your website article.

From what I've read on the above, I seem to be getting the warm tones that you get and like, in the highlights to mid-tones of my test prints. They are definitely pleasant and I may have to settle for them initially, it's just that I was expecting more yellow tones.

The mix that I am using, which uses just a very smaller amount of thiourea, at 8 to 2, where as you use a 10 to 2 mix. I will try adding a bit more thiourea and see if that makes a difference.

Note that I have now started a newly titled post about this:

http://www.film-and-darkroom-user.or...ad.php?t=13476

Terry S
Reply With Quote
Reply
Support our Sponsors, they keep FADU free:   AG Photographic   The Imaging Warehouse   Process Supplies   RH Designs   Second-hand Darkroom Supplies  

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
Sodium metaborate Domingo Chemical formulae 14 5th June 2015 06:10 PM
Sodium bi sulfite robinb Chemical formulae 9 25th April 2012 05:33 PM
need some Sodium thiosulphate pentahydrate robinb Chemical formulae 11 23rd March 2012 08:44 PM
Sodium Sulphite Rob Archer Chemical formulae 8 4th May 2009 01:52 PM
Rodinal + Sodium Sulphite ? RH Designs Chemical formulae 13 14th February 2009 11:46 AM


All times are GMT. The time now is 09:01 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.