Developer · Black and white
Harman/Ilford Perceptol
AvailableB&WPowder
Extra fine grain developer for when very fine grain matters more than film speed. Ilford recommends it for medium and slow films such as Delta 100, FP4 Plus and Pan F Plus.
- Type
- Powder
- Process
- B&W
- Temperature
- 20°C
- Dilutions
- 3
- Capacity
- 4
- Shelf life
- Unmixed powder indefinite
20–24°C (68–75°F)
rolls per litre
concentrate
Characteristics
GrainVery fine
AcutanceModerate, level 2 of 3
ContrastNormal, level 2 of 4
Extremely fine grain, for when a loss of film speed is acceptable
Dilutions
| Ratio | Use | Notes |
|---|---|---|
| stock | Replenishable | Reusable without replenishment: Ilford gives 4 films per litre, with the development time increased for each film. |
| 1+1 | One-shot | Diluted solution; Ilford says do not reuse and do not keep it more than 24 hours. |
| 1+3 | One-shot | Diluted solution; Ilford says do not reuse and do not keep it more than 24 hours. |
Shelf life
- Concentrate
- Unmixed powder indefinite
- Working Solution
- Stock solution 6 months in full capped containers (1 month half full). Diluted 1+1 or 1+3: no more than 24 hours.
Stock solution reused without replenishment, with the development time increased for each film. Lower capacity than ID-11.
Development times
| Film | Dilution | ISO | Time | Temp |
|---|---|---|---|---|
| FP4 Plus | stock | 125 | 12m | 20°C (68°F) |
| FP4 Plus | 1+1 | 125 | 15m | 20°C (68°F) |
| FP4 Plus | 1+3 | 125 | 21m | 20°C (68°F) |
| Ilford Delta 100 | stock | 100 | 15m | 20°C (68°F) |
| Pan F Plus 50 | stock | 50 | 14m | 20°C (68°F) |
| Pan F Plus 50 | 1+1 | 50 | 15m | 20°C (68°F) |
| Pan F Plus 50 | 1+3 | 50 | 17m | 20°C (68°F) |
| Ilford Delta 100 | 1+1 | 100 | 17m | 20°C (68°F) |
| Ilford Delta 100 | 1+3 | 100 | 22m | 20°C (68°F) |
| Kentmere Pan 100 | stock | 100 | 12m 30s | 20°C (68°F) |
Showing 10 of 72 entries.
Full guides for Perceptol
- HP5 Plus
- Delta 3200
- Delta 400
- FP4 Plus
- Fomapan 400 Action
- Kentmere Pan 400
- Kentmere Pan 100
- Ilford Delta 100
- Pan F Plus 50
- RPX 400
- RPX 25
- Fomapan 100 Classic
- Fomapan 200 Creative
- Ortho Plus
- SFX 200
- Kentmere Pan 200
- Retro 80S
- Foma Ortho 400
- RPX 100
- Infrared 400
- Ortho 25 Plus
- AgfaPhoto APX 100 (2013-)
- AgfaPhoto APX 400 (2013-)
Often used for
Maximum enlargementFine grain prioritySlow and medium speed films (Delta 100, FP4 Plus, Pan F Plus)
Limitations & warnings
- Reduces effective film speed (Ilford does not give an amount)
- Lower capacity than ID-11 and Microphen (4 films per litre of stock)
Descriptions combine manufacturer specifications with community experience. Subjective assessments reflect common sentiment among photographers and may not match your results.