Development time
Adox CHS 100 II in ADOX Atomal 49
6:30 at 20°C (68°F), stock dilution, box speed.
Start timer · 6:30- Time
- 6:30
- Dilution
- Stock
- Temperature
- 20°C
- Box speed
- ISO 100
Standard
68°F
B&W
All 2 times
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| Stock | 100 | 6:30 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+1 | 100 | 10:00 | 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 |
|---|---|---|---|---|---|---|
| 8:08 | 7:17 | 6:30 | 5:51 | 5:12 | 4:41 | 4:14 |
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 |
| 1+1 | 150 ml developer + 150 ml water | 250 ml developer + 250 ml water |
How they work together
- Adox CHS 100 II
- Ortho-panchromatic ISO 100 black-and-white film: a 1950s-style emulsion reintroduced by ADOX (Fotoimpex) in 2013 with modern cascade coating; sheet film returned 2018, 35mm 2020, 120 in 2023. Can be reversal processed; avoid tanning developers.
- Notes on this pairing
- Datasheet names ADOX ATOMAL.