C41 reversible process Film: Lomography color negative iso 400 type 120. Exposed at iso 200 Camera: Bronica EC 6x6 Step 1: B&W developer tetenal ultrafin 1:20 – 8 min 20C. Step 2: wash in water 5 min. Step 3: Exposing in light. All next steps can be made under light. Step 4: Drying (optional). Step 5: Regular c41 process. Finally, we get some pictures positive, some negative and some both.