Development time
Ilford Ilford Delta 100 in Rodinal
9:00 at 20°C (68°F), 1+25 dilution, box speed.
Start timer · 9:00- Time
- 9:00
- Dilution
- 1+25
- Temperature
- 20°C
- Box speed
- ISO 100
All 4 times
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| 1+25 | 50−1 stop | 7:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+25 | 100 | 9:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+50 | 50−1 stop | 10:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+50 | 100 | 14:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
EI is the speed the film was rated at when shooting. Evidence says where each time comes from: the manufacturer’s own data, a named test, a compilation or several agreeing reports (community consensus), or one person’s report. Times marked “not yet verified” come from secondary sources and haven’t been checked against a manufacturer datasheet. Where sources give different times, every one is listed and marked “sources differ”.
Other temperatures
| 18°C64°F | 19°C66°F | 20°C68°F | 21°C70°F | 22°C72°F | 23°C73°F | 24°C75°F |
|---|---|---|---|---|---|---|
| 11:15 | 10:05 | 9:00 | 8:06 | 7:12 | 6:29 | 5:51 |
Calculated from the 20°C (68°F) time using Ilford’s temperature compensation factors, not taken from a datasheet. Most B&W developers behave well between 18–24°C (64–75°F).
Mixing
| Dilution | 300 ml (10.1 fl oz) (one 35mm roll) | 500 ml (16.9 fl oz) (one 120 roll) |
|---|---|---|
| 1+25 | 12 ml developer + 288 ml water | 19 ml developer + 481 ml water |
| 1+50 | 5.9 ml developer + 294 ml water | 9.8 ml developer + 490 ml water |
How they work together
- Rodinal
- Prominent grain, high acutance, full film speed, variable contrast. Sharp, dramatic, distinct edge effects.
- Ilford Ilford Delta 100
- Core-Shell crystal technology for extreme sharpness and virtually invisible grain. Clinical and precise look.
Ilford Delta 100 in other developers
510-Pyro
14:30
1+100 · EI 100 · 20°C · 2 variants
D-76
9:00
Stock · EI 100 · 20°C · 8 variants
HC-110
6:00
1+31 · EI 100 · 20°C · 3 variants
ID-11
8:30
Stock · EI 100 · 20°C · 8 variants
Ilfosol 3
5:00
1+9 · EI 100 · 20°C · 2 variants
Ilfotec DD-X
10:30
1+4 · EI 100 · 20°C · 4 variants
Ilfotec HC
6:00
1+31 · EI 100 · 20°C · 6 variants
Ilfotec LC29
6:00
1+19 · EI 100 · 20°C · 6 variants
Other films in Rodinal
Kodak Tri-X 400
7:00
1+25 · EI 400 · 20°C · 3 variants
Ilford HP5 Plus
6:00
1+25 · EI 400 · 20°C · 4 variants
Ilford Delta 400
9:00
1+25 · EI 400 · 20°C · 4 variants
Ilford FP4 Plus
9:00
1+25 · EI 125 · 20°C · 4 variants
Foma Bohemia Fomapan 400 Action
5:30
1+25 · EI 400 · 20°C · 5 variants
Harman Technology Kentmere Pan 400
17:00
1+25 · EI 400 · 20°C · 3 variants
Kodak Double-X 5222
5:45
1+25 · EI 250 · 20°C · 3 variants
Ilford Pan F Plus 50
6:00
1+25 · EI 50 · 20°C · 2 variants