Development time
Kodak T-Max 400 in Pyrocat-HD
12:00 at 21°C, 1+1+100 dilution, EI 320 (−⅓ stop).
Start timer · 12:00Time
12:00
Continuous
Dilution
1+1+100
Temperature
21°C
Box speed
ISO 400
B&W
Development time
| Dilution | EI | Time | Temp | Agitation | Timer |
|---|---|---|---|---|---|
| 1+1+100 | 320−⅓ stop | 12:00 | 21°C / 70°F | Continuous | 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 |
|---|---|---|---|---|---|---|
| 16:40 | 14:56 | 13:20 | 12:00 | 10:40 | 9:36 | 8:40 |
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+1+100 | See the developer’s instructions | See the developer’s instructions |
How they work together
- Pyrocat-HD
- Fine grain, very-high acutance, full film speed, compensating contrast. Excellent highlight separation with olive-brown stain.
- Kodak T-Max 400
- Known for exceptionally fine grain among 400-speed B&W films. Tabular grain technology offers high sharpness and resolving power.
- Notes on this pairing
- Sandy King's sheet-film rotary time, 70°F (21.1°C), 2 min presoak.