ADOX HR-DEV
A developer that "flattens" the contrast curve—designed for ADOX HR-50, but also works with standard panchromatic films.
About the Developer
ADOX HR-DEV is a specialized liquid developer originally designed for ADOX HR-50 film (a low-sensitivity, fine-grain documentary film): it “flattens” the curve, provides a steeper rise from the shadows, and delivers reasonable detail separation all the way up to Zone 9. According to the manufacturer’s official chart, the developer is also suitable for standard panchromatic films—Ilford, Kodak, Kentmere—at significantly higher dilutions than HR-50, producing fine grain and high sharpness.
Character
A new-generation hydroquinone-based developer that optimizes the characteristic curve: it provides a steeper rise in the shadows and detail separation all the way up to the highlights. Designed for ADOX HR-50, but according to the manufacturer’s own chart, it is also suitable for standard films such as Ilford HP5+/FP4+/Delta, Kodak T-Max, and Tri-X at high dilutions.
Best films
ADOX HR-50, Ilford HP5+, FP4+, Delta 100/400, Kodak T-Max 100/400, Kodak Tri-X, AgfaPhoto APX 400, Kentmere 400.
How to Prepare and Use
- 1Dilute the concentrate according to the table for the specific film—for example, 1+49 for ADOX HR-50 or 1+30 for Ilford HP5+.
- 2Prepare the working solution immediately before use—this is a one-shot developer.
- 3For the first 30 seconds, agitate continuously; then follow the instructions for the specific film (usually 1–2 turns of the tank per minute).
- 4It is not necessary to maintain a precise temperature using a water bath—it is important that the room temperature be around 20–21°C; in hot weather, reduce the time accordingly.
- 5Drain the developer, process the film in the stop bath, fix it, and rinse it thoroughly.
Development times for different films
| Film | Breeding | Time @ 20°C |
|---|---|---|
| ADOX HR-50 (ISO 40) | 1+49 | 12 min |
| Ilford HP5+ 400 | 1+30 | 12 min |
| Kodak T-Max 400 | 1+30 | 11 min 30 sec |
| Kodak Tri-X 400 | 1+24 | 12 min |
Official ADOX data (manufacturer's technical specifications), 20°C, distilled water. With hard water, the processing time should be increased.
Pros
- It specifically "flattens" the characteristic curve—resulting in fewer blown-out highlights
- It works with both specialty document films and standard panchromatic films
- Does not require a water bath to stabilize the temperature
Cons
- A niche product is harder to find in retail stores than D-76 or HC-110
- With hard water, you'll have to figure out the time on your own
- Each film has its own dilution ratio—you can't just use one "standard" dilution for all situations