Development time
Ilford Ilford Delta 100 in XTOL
7:30 at 20°C (68°F), stock dilution, box speed.
Start timer · 7:30- Time
- 7:30
- Dilution
- Stock
- Temperature
- 20°C
- Box speed
- ISO 100
All 3 times
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| Stock | 50−1 stop | 6:30 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| Stock | 100 | 7:30 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| Stock | 200+1 stop | 9:30 | 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 |
|---|---|---|---|---|---|---|
| 9:23 | 8:24 | 7:30 | 6:45 | 6:00 | 5:24 | 4:53 |
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) |
|---|---|---|
| Stock | Use as mixed, undiluted | Use as mixed, undiluted |
How they work together
- XTOL
- Fine grain, high acutance, full film speed, normal contrast. Excellent shadow detail with wide latitude.
- 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 XTOL
Kodak Tri-X 400
7:00
Stock · EI 400 · 20°C · 18 variants
Kodak T-Max 400
6:30
Stock · EI 400 · 20°C · 17 variants
Ilford HP5 Plus
8:00
Stock · EI 400 · 20°C · 6 variants
Ilford Delta 400
7:30
Stock · EI 400 · 20°C · 11 variants
Ilford FP4 Plus
8:30
Stock · EI 125 · 20°C · 2 variants
Kodak T-Max 100
7:30
Stock · EI 100 · 20°C · 22 variants
Kodak T-Max P3200
13:30
Stock · EI 3200 · 20°C · 16 variants
Kodak Double-X 5222
7:00
Stock · EI 250 · 20°C · 2 variants