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Domingo A. Siliceo
19-Feb-2015, 04:16
I've looked for a thread showing black and white slides, but found none, so I'm gonna start this one.

After some weeks testing developers and bleaching combinations, I'm finally happy with the combo D-168 and D-158 developers over Fomapan 100 processed as a slide (reverse processed, I guess is the correct denomination).

Here are a couple of them, exposed with an Angulon 6.8/90mm f/22:



https://i0.wp.com/postalesdeayer.es/Diapos/diapo_apeadero_renfe_6.jpg

https://i0.wp.com/postalesdeayer.es/Diapos/diapo_apeadero_renfe_4.jpg

Corran
19-Feb-2015, 09:43
Very cool. I like them. Do you mind giving us a bit more info about these developers?


I'm finally happy with the combo D-168 and D-158 developers over Fomapan 100 processed as a slide

Domingo A. Siliceo
20-Feb-2015, 02:20
Thanks, Bryan.

I mainly followed Ian Grant's intructions on APUG (http://www.apug.org/forums/forum223/52001-kodak-b-w-reversal-processing-formulae.html) but customized the bleach bath to: 10ml Sulfuric Acid + 2.4grs Potassium Dichromate + 990ml demineralized water in 3.5 minutes.

Don't forget to use hardener in the fixer if you use Foma films because they are very easily scratchable.

Tim Meisburger
20-Feb-2015, 05:20
Interesting. What are the advantages (apart from the ability to project) of reversal processing?

I look forward to seeing more of these images.

Nathan Potter
20-Feb-2015, 11:39
I've used the reversal B&W images mounted in a light box rather than projected. When developed to a full tonal range (8 to 10eV and may be more) they make for a spectacular presentation.

Nate Potter, Austin TX.

Donald Qualls
20-Feb-2015, 12:48
My experience with (35 mm) reversal processing indicates about a 1 to 1 1/3 stop increase in film speed, coupled with a great reduction in the visibility of grain -- effectively, the coarse grains develop in the first developer and are bleached away, leaving the finer, less sensitive grains for the reversed image. So, Tri-X at EI 1000 with the grain of Plus-X. Perhaps less important in large format, but any real speed boost is welcome when shooting hand held with a Speed Graphic...

photonsoup
21-Feb-2015, 19:23
I mainly followed Ian Grant's intructions on APUG (http://www.apug.org/forums/forum223/52001-kodak-b-w-reversal-processing-formulae.html) but customized the bleach bath to: 10ml Sulfuric Acid + 2.4grs Potassium Dichromate + 990ml demineralized water in 3.5 minutes.

A couple of posts into that thread dr5chrome said:

"This formula will produce less than satisfactory positives.

I wish I could enlighten.

There will be published reversal tips in the upcoming new edition of the Darkroom Cookbook / Anchel"

That was in 2008, does anyone have a copy of the edition? Does it actually have reversal tips?

Domingo A. Siliceo
31-Jul-2016, 02:13
Some re-digitized slides, trying (with tiny success) to correct the mistake while bleaching, as you can clearly see in second and third images.

Both are Fomapan 100.



http://www.postalesdeayer.es/Diapos/LaEncarnacion/a.202.jpg

http://www.postalesdeayer.es/Diapos/LaEncarnacion/a.203.jpg

http://www.postalesdeayer.es/Diapos/LaEncarnacion/a.201.jpg

Randy Moe
31-Jul-2016, 03:24
Ilford Reversal instructions.

http://www.ilfordphoto.com/Webfiles/20114271220441194.pdf

greenechere
31-Jul-2016, 06:27
Do you mind giving us a bit more info about these developers?

http://hautavis.net/146/o.png

tgtaylor
31-Jul-2016, 19:33
A couple of posts into that thread dr5chrome said:

"This formula will produce less than satisfactory positives.

I wish I could enlighten.

There will be published reversal tips in the upcoming new edition of the Darkroom Cookbook / Anchel"

That was in 2008, does anyone have a copy of the edition? Does it actually have reversal tips?

The "tips" were published in the 3d edition of the cookbook - the 4th edition was published earlier this year. Last year I did several B&W reversal experiments using those tips and the results are given here: http://www.largeformatphotography.info/forum/showthread.php?125393-Reversal-Processing-with-D-11 Except for the apparent scriveners error in the solution ratio (1:3 which I found to be 3:1 - see the examples), the tips are valid and delivers good results.

Thomas

panoral
31-Jul-2016, 21:10
http://www.mr-alvandi.com/technique/reversal-processing-black-and-white-films.html

Randy Moe
31-Jul-2016, 21:24
http://www.mr-alvandi.com/technique/reversal-processing-black-and-white-films.html

Very interesting.

Thanks for posting your process.

panoral
3-Aug-2016, 21:25
Very interesting.

Thanks for posting your process.

Thanks

DSkorupka
2-Nov-2016, 02:33
After the semester ends I will try improving this acid-hydroxide process. http://www.filmlabs.org/docs/citric-hydrogen-peroxide-bleach.pdf
Step 1 will be to replace Caffenol-C with XTOL and to replace lime juice with food grade citric acid.
I will start with the only obtainable high concentration stock, 12% via Amazon and water down to 9%.
From there I will see if I can't further reduce the concentration of H2O2 by increasing duration.

If the results are good I will move from short rolls of 35mm fp4
to "Galaxy" (Slavich) "120" (<100) positive (if you reverse process it) paper.