Development time
Adox Scala 50 in ADOX Atomal 49
8:30 at 20°C (68°F), stock dilution, box speed.
Start timer · 8:30- Time
- 8:30
- Dilution
- Stock
- Temperature
- 20°C
- Box speed
- ISO 50
Standard
68°F
B&W
Development time
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| Stock | 50 | 8:30 | 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 |
|---|---|---|---|---|---|---|
| 10:38 | 9:31 | 8:30 | 7:39 | 6:48 | 6:07 | 5:32 |
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
- Adox Scala 50
- The HR-50 emulsion packaged and rated for B&W reversal processing in the ADOX SCALA kit to make black-and-white slides; successor to Scala 160.
- Notes on this pairing
- Negative processing. Adox says Scala 50 can be developed as a negative using HR-50 times; time from the HR-50 datasheet (ADOX ATOMAL).