titrisol wrote: ↑Fri Jan 27, 2023 8:19 am
...
I've seen some documents/tutorials.instructions but for my understanding please clarify
As per Julio's notes
1st developer you over develop?
Bleach to completion
Hypo?
Re-expose
Re-develop to completion? or by inspection
Fix?
Wash
...
I'd watch the Youtube video I linked in the original post, but here's what I've done so far:
Generic B+W Reversal
Step 1
1st Developer: needs to be a “dense negative”, denser is better. All films should be the same time (like colour neg). Might need to experiment a bit here.
Step 2
Bleach: 250ml Hydrogen Peroxide 3% + 15ml White Vinegar (should be run warm / hot, but take care not to “shock” the film with a big temperature change. Run for at least 6 minutes. Longer doesn’t hurt. Solution can be re-used, but leave space in container as it can expand.
Step 3
Re-expose film to light.
Step 4
Re-develop, can use developer from step 1. Develop for normal time, though you can’t really over-develop at this stage.
Step 5
Fix as usual (not 100% necessary)
Step 6
Rinse as usual
My Tests
Rollei Retro 400s at 200
1. Develop in Rodinal 1+25 @23c for 15 minutes
2. Rinse / soak 10 minutes at 25c
3. Bleach @30c for 15 minutes
4. Re-expose 2-3 minutes
5. Re-develop in Rodinal 1+25 15 minutes
6. Rinse
These look a little underexposed, so might need to either develop a little longer / hotter, or shoot at EI100.
(Normal development time for Rollei Retro 400s is 10 minutes for Rodinal 1+25)
Fomapan 100 at 100
1. Develop in PC-TEA 1+30 @25c for 12 minutes
2. Bleach for 20 minutes @30c
3. Re-expose to light (bright bulb) 2-3 minutes
4. Re-develop PC-TEA 1+30 @25c for 12 minutes
5. Rinse
The exposure on these looks to be pretty good.
I have seen some people recommend using a paper developer, but since I don't do darkroom printing, I don't have anything to try with.