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Ilford Photo

Microphen

B&W developer Powder In production Reusable undiluted only

Development times

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Showing 2 of 200 published times.

Film Dilution EI Time Source
Foma Ortho 400 stock 20.0 °C 400 8:00
Verified Datasheet Report
Foma Ortho 400 stock 30.0 °C 400 3:30
Verified Datasheet Report

Reuse

Checked 21 October 2026

Ilford says whether Ilford Microphen 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+90 % for film 10.

Capacity, as the maker states it: 10 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. ... The table below gives the number of 135/36 or 120 roll films a litre of stock PERCEPTOL, ID-11 and MICROPHEN can process provided that the developer is reused. ... We do not recommend reusing diluted developers, 1+1 and 1+3, always use fresh solutions on each occasion. ... PERCEPTOL, ID-11 and MICROPHEN diluted 1+1 or 1+3 should not be kept for more than 24 hours.

ILFORD PERCEPTOL, ID-11 AND MICROPHEN FILM DEVELOPERS - powder developers for low volume B&W processing without replenishment (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

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Specification

Type
B&W developer
Form
Powder
Capacity rolls per litre
10.0
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.

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