C-41 Color Negative
The standard color negative film development process used worldwide. C-41 involves multiple chemical baths: color developer (containing CD-4 color developing agent), bleach, fixer (or combined blix), stabilizer, and wash steps. Processing is done at 38C (100.4F) with precise temperature control. The color developer creates both the silver image and complementary dye images simultaneously. After bleaching and fixing, only the dye images remain. Home processing is possible with commercially available C-41 kits.
Mixing Instructions
Start with 800 ml of water at 35-40 °C.
- Dissolve potassium carbonate, stirring until clear.
- Dissolve sodium sulfite.
- Dissolve potassium bromide.
- Add hydroxylamine sulfate and stir until dissolved.
- Finally, add CD-4 developing agent.
- Add water to make 1 liter.
Temperature must be maintained at 37.8 °C (100 °F) during use for consistent color balance.
Ingredients for 1L of Working Solution
Volume:
ml
| # | Chemical | Role | Qty (1L) | Unit | Note |
|---|---|---|---|---|---|
| 1 | Potassium Carbonate | Accelerator | 37.5 | g | |
| 2 | Sodium Sulfite | Preservative | 4.2 | g | |
| 3 | Potassium Bromide | Restrainer | 1.3 | g | |
| 4 | Hydroxylamine Sulfate | Preservative | 2.0 | g | |
| 5 | CD-4 | Developing Agent | 4.8 | g |
Process Parameters
Temp:°C
| Film Stock | ISO | Dilution | Temp | Time | Agitation | Source | Notes |
|---|---|---|---|---|---|---|---|
| Color Negative (All) | 400 | stock | 37.8°C | 30:38 (approx.) | Standard C-41 developer step. Temperature precision +/- 0.1C is critical. |