Development time
Kodak Tri-X 400 in PMK Pyro
14:00 at 21°C, 1+2+100 dilution, EI 260 (−⅔ stop).
Start timer · 14:00Time
14:00
Standard
Dilution
1+2+100
Temperature
21°C
Box speed
ISO 400
B&W
Development time
| Dilution | EI | Time | Temp | Agitation | Timer |
|---|---|---|---|---|---|
| 1+2+100 | 260−⅔ stop | 14:00 | 21°C / 70°F | Standard | Start timer |
EI is the speed the film was rated at when shooting. Times marked “not yet verified” come from secondary sources and haven’t been checked against a manufacturer datasheet.
Other temperatures
| 18°C | 19°C | 20°C | 21°C | 22°C | 23°C | 24°C |
|---|---|---|---|---|---|---|
| 19:27 | 17:25 | 15:33 | 14:00 | 12:27 | 11:12 | 10:07 |
Calculated from the 21°C time using Ilford’s temperature compensation factors, not taken from a datasheet. Most B&W developers behave well between 18°C and 24°C.
Mixing
| Dilution | 300 ml (one 35mm roll) | 500 ml (one 120 roll) |
|---|---|---|
| 1+2+100 | See the developer’s instructions | See the developer’s instructions |
How they work together
- PMK Pyro
- Fine grain, very-high acutance, full film speed, compensating contrast. Extraordinary highlight separation with proportional staining.
- Kodak Tri-X 400
- A classic photojournalism film with a long heritage. Known for its distinctive gritty grain, high contrast, and strong push-processing capability.
- Notes on this pairing
- 70°F (21.1°C). Two inversions every 15 s.