u/Ready-Recording8012

Opened a can with this rare ORWO PC7 color positive for cinema copies, I develope this film using these settings:

• Developer: Cinestill ECN-2 developer (make up 1 liter from the bag), add 1.2 g/L CD-3 and 100 mg/L BZT. Stir for 1 hour at 45°C.
• Exposure: Rate the PC7 at ISO1
• Development: 40 minutes at 20°C. Continuous inversions for the first minute, then one inversion after 20 minutes.
• Stop bath: 2% vinegar for 1 minute.
• Rinse: About 15 minutes. This is an important step to minimize staining/discoloration caused by the following bleach.
• Bleach: 5–10 minutes, depending on how exhausted the bleach already is.
• Wash: 5 minutes.
• Fix: I use a milder sodium thiosulfate fixer.

Not the easiest film to deal with as the negatives are quite orange (so blue tint when inverted) but with a nice clear base. I also tried shooting with a 85b filter, but that also kills much of the green sensitiviy.

After a lot of testing with different developer setups, development times, and both positive and negative processing options, I finally ran my ORWOCHROME UT-18 using these settings:

• Developer: Cinestill ECN-2 developer (make up 1 liter from the bag), add 1.2 g/L CD-3 and 100 mg/L BZT. Stir for 1 hour at 45°C.
• Exposure: Rate the UT-18 at ISO 12–25.
• Development: 50 minutes at 20°C. Continuous inversions for the first minute, then one inversion after 25 minutes.
• Stop bath: 2% vinegar for 1 minute.
• Rinse: About 10 minutes. This is an important step to minimize staining/discoloration caused by the following bleach.
• Bleach: 5–10 minutes, depending on how exhausted the bleach already is.
• Wash: 5 minutes.
• Fix: I use a milder sodium thiosulfate fixer.

The full recipe is here:
https://www.reddit.com/r/Darkroom/comments/1oqrm40/successful_stand_development_for_old_orwo_ut18/