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Ilford Photo

Ilfotec HC

B&W developer Liquid concentrate In production Reusable at some dilutions Replenishable

Development times

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Showing 2 of 86 published times.

Film Dilution EI Time Source
Delta 400 Professional 1+31 20.0 °C 200 pull 1 stop 5:00
Verified Datasheet Report
Delta 400 Professional 1+31 24.0 °C 200 pull 1 stop 4:00
Verified Datasheet Report

Reuse

Checked 21 October 2026

Ilford says whether Ilford Ilfotec HC may be reused depends on how it is used. It can also be replenished.

  • 1+11 use once
  • 1+15 may be reused
  • 1+31 may be reused

1+15: +10 % development time for each successive film in a litre (N, N+10 %, N+20 % ...), up to N+90 % for film 10.

1+31: +10 % development time for each successive film in a litre (N, N+10 %, N+20 % ...), up to N+40 % for film 5.

Capacity, as the maker states it: Reused working solution: 10 films per litre at 1+15, 5 films per litre at 1+31.

ILFOTEC HC 1+15 and 1+31 working strength developer in spiral tanks without replenishment to process either a number of films individually or multiple films in batches. ... The table below gives the number of 135/36 or 120 roll films a litre of working strength ILFOTEC HC can process provided that the developer is reused. ... ILFOTEC HC 1+15: 10 films/litre; ILFOTEC HC 1+31: 5 films/litre. ... We do not recommend reusing diluted developers, 1+47, always use fresh solutions on each occasion. ... Do not use ILFOTEC HC developer as replenisher.

ILFORD ILFOTEC HC Technical Information (Harman, June 2010, 13 pp.) ↗

Dilutions

  • 1+11 1 + 11 water
  • 1+15 1 + 15 water
  • 1+31 1 + 31 water

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Specification

Type
B&W developer
Form
Liquid concentrate
Capacity rolls per litre
—
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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