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Old 25th October 2020, 01:19 PM
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David Lingham David Lingham is offline
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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.
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Old 25th October 2020, 01:37 PM
Terry S Terry S is offline
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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
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