Development times
Showing 6 of 108 published times.
| Film | Dilution | EI | Temp | Time | Agitation | Source |
|---|---|---|---|---|---|---|
| Delta 400 Professional | 1+1 20.0 °C | 200 pull 1 stop | 12:30 | Ilford — 4 inversions every 60 s | ||
| Delta 400 Professional | 1+3 20.0 °C | 200 pull 1 stop | 18:30 | Ilford — 4 inversions every 60 s | ||
| Delta 400 Professional | stock 20.0 °C | 200 pull 1 stop | 10:00 | Ilford — 4 inversions every 60 s | ||
| Delta 400 Professional | 1+1 24.0 °C | 200 pull 1 stop | 9:00 | Ilford — 4 inversions every 60 s | ||
| Delta 400 Professional | 1+3 24.0 °C | 200 pull 1 stop | 14:30 | Ilford — 4 inversions every 60 s | ||
| Delta 400 Professional | stock 24.0 °C | 200 pull 1 stop | 7:00 | Ilford — 4 inversions every 60 s |
Reuse
Checked 21 October 2026
Ilford says whether Ilford Perceptol may be reused depends on how it is used.
- stock may be reused
- 1+1 use once
- 1+3 use once
Longer time for reuse: +10 % development time for each successive film in a litre (N, N+10 %, N+20 % ...), up to N+30 % for film 4.
Capacity, as the maker states it: 4 x 135/36 or 120 films per litre of stock solution when reused without replenishment.
ID-11, MICROPHEN and PERCEPTOL stock developers can be used in spiral tanks or deep tanks without replenishment to process either several films individually or multiple films in batches. ... We do not recommend reusing diluted developers, 1+1 and 1+3, always use fresh solutions on each occasion. ... 'One-shot' processing using stock, or 1+1 or 1+3 developers eliminates or greatly reduces these problems.
ILFORD PERCEPTOL, ID-11 AND MICROPHEN FILM DEVELOPERS (Harman, Aug 2024, 9 pp.) ↗
Dilutions
- stock undiluted stockStock solution The concentrated form of a chemical, or a developer used undiluted. Read more in the glossary ›
- 1+1 1 + 1 water
- 1+3 1 + 3 water
Link to this page
Specification
- Type
- B&W developer
- Form
- Powder
- Capacity rolls per litre
- 4.0
- Shelf life, unopened
- —
- Shelf life, opened
- —
A dash means the figure has not been read off the maker’s sheet. A guess here would produce wrong answers silently.
Suggest a time or report a mistake
Know a time for Perceptol that is missing here, or spotted one that is wrong? Tell us, with the source, and a curator will check it.
- Sources only. We publish a time only when it has been read off a primary source: the maker’s datasheet or chart. A link to it is what lets us check yours.
- Nothing goes up by itself. Every report is read by a person before anything on the page changes.
- No account needed. Your name and email are optional, and only to reply to you.
0 reviews
Written by photographers, under their own profile — so you can see what they shoot before you weigh what they say.