Developer · Black and white
DIY/Homebrew 510-Pyro
AvailableB&WLiquid Concentrate
Also known as: Jay DeFehr's 510-Pyro
Formulated by Jay DeFehr and described by the technical sheet as an extremely fine-grained, high acutance, long shelf-life staining developer. Recommended 20C (18 to 24C), with semi-stand agitation for most films.
- Type
- Liquid
- Process
- B&W
- Temperature
- 20°C
- Dilutions
- 1
- Shelf life
- 10 years in full tightly capped bottles (5 to 6 years half full), stored at 4 to 20C
18–24°C (64–75°F)
concentrate
Characteristics
GrainVery fine
AcutanceVery high
ContrastCompensating
Exceptional highlight control with subtle staining
Dilutions
| Ratio | Use | Notes |
|---|---|---|
| 1+100 | One-shot | Supplied for 1:100 one-shot use. Zone Imaging says further dilution is possible for economy but costs image quality and lengthens times. |
Shelf life
- Concentrate
- 10 years in full tightly capped bottles (5 to 6 years half full), stored at 4 to 20C
- Working Solution
- Do not keep more than 2 hours; use once and discard
A 100 ml bottle develops 30 135/36 films at 1+100 in a Paterson tank. Minimum 1 ml per 80 sq. inches of film.
Development times
| Film | Dilution | ISO | Time | Temp |
|---|---|---|---|---|
| CatLABS X Film 320 Pro (120) | 1+100 | 320 | 13m 30s | 20°C (68°F) |
| T-Max 100 | 1+100 | 64 | 20m | 20°C (68°F) |
| Fomapan 100 Classic | 1+100 | 80 | 10m 30s | 20°C (68°F) |
| Ilford Delta 100 | 1+100 | 100 | 14m 30s | 20°C (68°F) |
| FP4 Plus | 1+100 | 125 | 20m 25s | 20°C (68°F) |
| Kentmere Pan 400 | 1+100 | 400 | 20m 30s | 20°C (68°F) |
| T-Max 400 | 1+100 | 400 | 30m 45s | 20°C (68°F) |
| Delta 400 | 1+100 | 400 | 22m | 20°C (68°F) |
| Tri-X 400 | 1+100 | 400 | 16m 25s | 20°C (68°F) |
| HP5 Plus | 1+100 | 400 | 9m | 20°C (68°F) |
Showing 10 of 23 entries.
Often used for
Slow to medium films ISO 50 to 200, T-Max and Delta 400Silver gelatine printing, UV alternative printing and scanning from the same negativeSemi-stand development (Rudiger Hartung method)
Limitations & warnings
- Pyro stain: spills stain surfaces
- No acid stop bath or hypo clear (they destroy the stain); use a water stop bath
- Not compatible with Bergger Pancro 400
Descriptions combine manufacturer specifications with community experience. Subjective assessments reflect common sentiment among photographers and may not match your results.