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Slimy brine

The short answer Throw it out

Throw it out: brine that has turned thick, stringy or slimy is a sign the ferment has spoiled. Throw out the whole batch and wash the jar well.

Reviewed October 26, 2026 · 12 facts, each with its source

An open jar of fermented radishes with a spoon from which the pink brine falls in a thick, unbroken string, like egg white AI

When in doubt, throw it out. Fervida can’t see your jar. No page can tell you something is safe: it can show you how to look.

What you see

The brine has changed body, not just color. It's thick, like oil or egg white; it drips slowly off a spoon, forms strings when you lift it or leaves your fingers slimy. The vegetables often feel slippery too when you take them out.

This isn't the same as cloudy brine. Cloudy brine has lost its clarity but is still runny like water, and it's normal in the first week: it clears over the weeks. Slimy brine has changed texture.

Why it happens

It's a sign the ferment has spoiled: microbes that ruin it have taken hold. The guides link it mainly to two causes: too much heat during fermentation and too little salt. It also shows up on vegetables left above the brine, in the air, where these microbes grow alongside molds and yeasts.

What to do

Throw it all out

Throw out the vegetables and the liquid, the whole jar. Don't try to save it by changing the brine or rinsing the pieces: the sliminess isn't only in the liquid, it's a sign the whole ferment has spoiled. Food safety guides say the same for sauerkraut, pickles and any slimy ferment: it goes.

Some people let a thick brine carry on to see whether it sorts itself out. None of the guides we follow allows for that, so here we go by theirs: throw it out.

Wash the jar, the weight and the lid in hot soapy water, and rinse them with very hot water before using them again. When in doubt, throw it out.

How to prevent it

  • The salt the recipe calls for, weighed on a scale. Don't cut back on it.
  • A temperature of 68–72 °F (20–22 °C). Above about 78 °F (26 °C), the fermentation runs ahead and spoils more easily.
  • Every vegetable below the brine.
  • Everything clean before you start: the jar, the weight and the lid.

Where every figure comes from

Every statement on this page comes from a food safety guide. We keep a copy of each source and quote its exact words, in its original language.

  1. 1

    Cloudy brine in the first week is normal and clears

    “The brine becomes cloudy as the fermentation proceeds (week 1), then clears (week 4).”

    BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.1: Fermented Vegetables (August 2024, updated December 2024) · read on October 25, 2026

  2. 2

    On whatever sticks out of the brine, slime-causing microbes, molds and yeasts grow

    “At the sides of the crock, in the places where the pickles are above the surface of the brine, slimy spoilage agents, moulds and yeasts continue to grow.”

    BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.1: Fermented Vegetables (August 2024, updated December 2024) · read on October 25, 2026

  3. 3

    If it's slimy or smells rotten, throw it out

    “If fermented product is slimy, smells spoiled/rotten, discard it.”

    University of Illinois Extension · Fermentation handout (2020) · read on October 20, 2026

  4. 4

    When in doubt, throw it out

    “When in Doubt—Throw it Out”

    University of Illinois Extension · Fermentation handout (2020) · read on October 20, 2026

  5. 5

    Weigh the salt

    “It is best to weigh salt for accuracy.”

    University of Illinois Extension · Fermentation handout (2020) · read on October 20, 2026

  6. 6

    If pickles go soft, slimy or smell off, throw them out

    “Caution: If the pickles become soft, slimy, or develop a disagreeable odor, discard them.”

    National Center for Home Food Preservation (USDA, University of Georgia) · Dill Pickles · read on October 26, 2026

  7. 7

    Slimy sauerkraut has spoiled: throw it out

    “Slimy kraut (indicates spoilage; discard kraut)”

    Oregon State University Extension Service · Sauerkraut: Problems and solutions · read on October 26, 2026

  8. 8

    It comes from too much heat while fermenting or too little salt

    “Too high temperature during fermentation. Too low salt content.”

    Oregon State University Extension Service · Sauerkraut: Problems and solutions · read on October 26, 2026

Show the remaining 4 claims
  1. 9

    Wash the jar, weight and lid in hot soapy water

    “The fermentation container, plate, and jars must be washed in hot sudsy water, and rinsed well with very hot water before use.”

    National Center for Home Food Preservation (USDA, University of Georgia) · Suitable Containers, Covers, and Weights for Fermenting Food · read on October 26, 2026

  2. 10

    Don't cut back the salt in sauerkraut or fermented pickles

    “Caution: Do not attempt to make sauerkraut or fermented pickles by cutting back on the salt required.”

    National Center for Home Food Preservation (USDA, University of Georgia) · General Information on Fermenting · read on October 26, 2026

  3. 11

    68–72 °F is ideal; above 78 °F it spoils

    “A temperature between 68 and 72 degrees Fahrenheit is ideal. Temperatures over 78 degrees Fahrenheit can cause over fermentation and spoilage.”

    University of Minnesota Extension · Preserving food at home: Fermentation (reviewed 2026) · read on October 25, 2026

  4. 12

    Every vegetable below the brine

    “All produce should be submerged in the brine liquid.”

    UC Davis, Department of Food Science and Technology · Common issues with fermented fruits and vegetables (v1.0, 15-mar-2022) · read on October 20, 2026