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What went wrong?

My colour negatives are dark and muddy, with a brownish or grey base

Negatives and slides

What you're seeing

The negatives look heavy and dull. The clear film between frames is brownish or greyish instead of clean orange. Scans are contrasty, with highlights that lack detail and colours that will not correct.

Check this first

Check this first

Look at the unexposed film between frames and at the leader. Clean orange with a dense image points to exposure or development; brownish or grey everywhere points to bleaching, fogging or contamination.

Likely causes, most common first

  1. 01

    Retained silver: weak, short or exhausted bleach or bleach-fix

    Common
    How to tell
    The base and rebate look brownish or murky, not clean orange. Dense areas are worst. Scans gain contrast and lose highlight detail. Bleach or bleach-fix was near the end of its life, cold, short, or reused many times.
    Test it
    Cut off one spoiled frame. Put it through fresh bleach-fix (or bleach then fixer) for the full time, then wash, stabilise and dry. If it clears and lightens compared with the rest, silver was left in the film.
    The fix
    Rebleach and refix the whole roll in fresh solutions, then wash and stabilise again. Next time give the full bleach-fix time for the number of films (it rises with each reuse) and keep it at temperature.

    Sources Kodak Alaris, Using KODAK FLEXICOLOR Chemicals (Process C-41); Kodak Alaris, Using KODAK Chemicals in Minilabs; Tetenal, Tetenal Colortec C-41 Kit Instructions for Use; Fujifilm, Processing Manual: Fujicolor Negative Process CN-16Q, CN-16FA, CN-16L

  2. 02

    Overexposure

    Common
    How to tell
    The base between frames is clean orange and the edge printing looks normal. Only the pictures are dense, and frames vary with the light you shot in.
    Test it
    Compare frames shot in different light. If density follows the scene and the edges look normal, it is exposure. Check your meter against a phone app or sunny 16.
    The fix
    Overexposed colour negatives can often still be scanned or printed. Check the meter, the ISO setting and the shutter.

    Source Kodak, Kodak Portra 400 Technical Data

  3. 03

    Overdevelopment: developer too hot or too long

    Occasional
    How to tell
    Every frame and the edge printing are dense and contrasty, with a clean orange base. More than one roll from the same session is affected.
    Test it
    Check your thermometer against a second one, and check the time you used against the kit's table for the number of films.
    The fix
    Keep the developer at its stated temperature and time. In Kodak's process, higher temperature or longer time increases the amount of dye formed.

    Sources Kodak Alaris, Using KODAK FLEXICOLOR Chemicals (Process C-41); Tetenal, Tetenal Colortec C-41 Kit Instructions for Use

  4. 04

    Fog from age, heat or X-rays

    Occasional
    How to tell
    Raised density everywhere, including the unexposed edges and between frames, often with a colour cast. The film was old, stored warm, or went through checked-baggage CT scanning.
    Test it
    Compare the edge of this roll with a fresh roll processed in the same chemistry. If only the suspect roll has a dense edge, the film was fogged before processing.
    The fix
    Store film cool, hand-carry film through airport security and ask for a hand inspection where possible. Processed film is not affected by X-rays.

    Source Kodak Alaris, Storage and Care of KODAK Photographic Materials

  5. 05

    Colour developer contaminated with bleach-fix

    Rare
    How to tell
    An unusual mask colour, high density in clear areas but weak dense areas, so the negative looks flat and muddy rather than heavy.
    Test it
    Process a test roll in freshly mixed developer with clean, dry equipment. If it is normal, the old developer was contaminated.
    The fix
    Mix fresh developer. Rinse thermometers, jugs and reels between baths, and never pour back into the wrong bottle.

    Sources Tetenal, Tetenal Colortec C-41 Kit Instructions for Use; Fujifilm, Processing Manual: Fujicolor Negative Process CN-16Q, CN-16FA, CN-16L

Avoiding it next time

  • Track how many films each batch of bleach-fix has done.
  • Extend bleach-fix time as the kit's table says when reusing it.
  • Rinse equipment between baths.
  • Store film cool.

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