How To: Split Toning Sepia/Selenium
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- เผยแพร่เมื่อ 25 ก.ย. 2024
- In this video I show I do to a split-toned image Sepia-Selenium in the darkroom.
Paper: Ilford MG FB classic Glossy
All process at about 20 deg C
1. Bleach
30 sec in 15 g/L potassium ferricyanide + 8 g/L potassium bromide
2. Sepia toner
1 min in 2 g/L thiourea + 8 g/L potassium hydroxide
3. Selenium toner
2-3 mins in Ilford Selenium toner diluted 1/10
Note: the actual formulas of the silver halides salts formed during the sepia and selenium toning are AgS2 (silver sulphide) and AgSe2 (silver selenide) respectively. I used simplified--but incorrect--formulas in the video (AgS and AgSe).
Excellent video! Thanks for taking the time to show how this process can be completed in home darkrooms.
Time consuming but well worth the effort; I highly recommend it.
Thank you Marco, very good insights. I definitely gonna try this!
Fantastic video!
GRAZIE
Amazing video; super helpful. Thank you!
Very informative. Looking forward to giving it a try!
Great video! Thank you! )))
Thank you for your clear and comprehensive video. I’ve recently tried this technique with some good results. There is one difference; I go from the sepia toner to the selenium toner with only a 2-3 minute wash between. Do you think it is necessary to carry out a full wash between the two toners?
Silver sulfide Ag2S
Silver selenite Ag2Se
You are correct on the formulas. I think I did not want to add too many numbers in my description. However it is silver seleniDe Ag2Se, silver seleniTe would have selenium with oxidation state +4 as Ag2SeO3. This might be part of what is in the toner, altought I am just speculating.
Hi Marco, this video was really great. Around 6:12 you mentioned something about a separate video that shows possible different colors in the sepia tone that result from using different ratios of Thiourea and Potassium Hydroxide. Did you post this other video? I would like to know more (specifically what ratio you used to get the "colder" sepia tone)
I find the ratio that I used in this video (8 g thiourea and 2 g potassium hydroxide per liter) to be the most pleasing. In my testing both higher and lower ratio were a less pleasant and warmer shade of yellow. This is why I was not motivated to do a follow up video, because I found the 8:2 ratio used in this video to be my favorite!
@@MarcoFantin1 Thanks !
Put a bit of petrol or other organic solvent on that apple cider label and peel it off, bad habits. Real enjoying the video mind just the health and safety officer in me coming out.
This is a very good point, I appreciate your comment. That bottle no longer exists!
Can this be done with off the shelf sepia toner? Or do you have to mix specific chemicals to a specific dilution?...Also, do bleach come in any sort of off the shelf kit? I don't care much for playing chemistry.
This was done with off the shelf sepia. For bleach is just one chemical, potassium ferricyanide, ti dissolve in water, so pretty straightforward. Just need that a $10 balance for weighing a small amount
@@MarcoFantin1 Perfect! Any sources on how much Pot. Ferri. to mix to water? I'm not great at chemical mixing and ratios lol. I barely passed chemistry.
Hi would this work with FOTOSPEED Sepia and Kodak selenium?
Great vid bro👏Would this work using a standard bleach and sepia kit then selenium toning at the end?
Yes, I think it would work the same.
How do you control the different tones of brown ? Have you publish the video yet ?
The tones of brown can be controlled by changing the potassium hydroxide/thiourea ratio. I think the recipe described in this video gives the best shade of brown. Changing it gives more of a yellow tone, with lower contrast, that I think it is not suitable for most photos.
@@MarcoFantin1 is it supposed to be sodium hydroxide instead of potassium hydroxide
Where do you purchase your chemicals from!?!
Photographers' formulary or ebay. I would trust the former more. Also, I may have gotten a few grams of KOH from the lab (I am a chemist). I won't get in prison for that. I remember in grad school my prof used to take 1 kg bottles just to unclog the toilet 😂.
is it not sodium hydroxide??