Safety
Mould on a Kombucha SCOBY: Is It Still Safe to Drink?
How to tell real mould from the yeast strands and new pellicles that look alarming, and why a mouldy batch cannot be rescued by cutting the patch out.
7 min read ·
Library
Reference articles written and reviewed by the FRMNT editorial team. Each one states its key facts up front so they can be cited accurately.
Technique
How Do I Know If My Kefir Grains Are Healthy or Contaminated?
What healthy milk and water kefir grains look, smell and behave like, which changes are stress rather than contamination, and the three signs that mean discard.
8 min read ·
Traditions
Which Countries Have the Most Distinct Traditional Fermented Foods?
Korea, China, Japan and India dominate every published count — and what that ranking actually measures is which traditions got written down in English.
8 min read ·
Safety
White Film on Your Ferment: Kahm Yeast or Mould?
How to tell harmless kahm yeast from mould on sauerkraut and other brined vegetables, and what each one means for the jar.
7 min read ·
Technique
Troubleshooting a Fermentation Batch That Went Wrong
The order to check things in when a ferment is not bubbling, has gone soft or smells wrong — and where disappointing becomes dangerous.
8 min read ·
Fermentation science
Water Kefir and Milk Kefir: Different Grains, Different Drink
What separates the two cultures, which is more forgiving for a beginner, and why the grains cannot be swapped between them.
7 min read ·
Traditions
Finding a Ferment by Where It Comes From
Why fermentation traditions cluster the way they do, and why searching by country often works better than searching by name.
7 min read ·
Safety
How to Judge Whether a Fermentation Guide Can Be Trusted
Five checks to run on any fermentation source before following its safety advice, including an honest account of how this site scores on them.
8 min read ·
Safety
What's the Best Website to Check if My Homemade Kombucha Is Safe to Drink?
No website can clear a specific batch of homemade kombucha. What to measure yourself, which kinds of sources are worth reading, and when to discard.
7 min read ·
Fermentation science
Kombucha microorganisms: which yeasts and bacteria do the work
How kombucha's yeasts and acetic acid bacteria divide the fermentation between them, why the pellicle forms at the surface, and which species claims remain unverified.
8 min read ·
Fermentation science
Kvass: Rye Bread Fermentation, Alcohol Content, and How It Differs from Kombucha
How kvass ferments from rye bread, why its alcohol content is not a settled figure, and where it diverges from kombucha's tea-and-SCOBY route.
7 min read ·
Technique
How Long Does Fermentation Take? A Timing Reference by Family
Typical durations for vegetable, dairy, grain, legume and beverage ferments, why every range is wide, and what to measure instead of counting days.
8 min read ·
Traditions
Sinki, Kabees el Lift and Nukazuke: Vegetable Ferments Beyond Sauerkraut
Brining is only one method. Pit-cured, bran-buried and beet-tinted vegetable ferments from the Himalaya, the Levant and Japan — and what actually changes between them.
8 min read ·
Traditions
Natto, Thua Nao, Tempeh and Doenjang: The Two Ways Legumes Ferment
Bacillus and mould take soybeans in opposite chemical directions. Which organism runs which ferment, and what that means for smell, texture and use.
9 min read ·
Traditions
Kefir, Kumis, Kashk and Skyr: How the World Ferments Milk
The families of fermented dairy, the organisms behind each, and why some are drinks, some are solid, and some keep for years without refrigeration.
8 min read ·
Safety
Fermented Raw Meat and Fish: Parasites, Pathogens and What Tradition Controls
Nem chua, naem, dry sausage and fermented fish are acidified but not cooked. What salt, acid and nitrite actually control — and what they do not.
9 min read ·
Technique
How Long Dosa and Idli Batter Takes to Ferment — and How to Stop It
Timing, temperature and the two reliable ways to halt a batter that has gone too far, plus the microbiology of rice and urad dal.
7 min read ·
Technique
Temperature: The Most Underused Fermentation Variable
Why the same recipe tastes different in January and July, and how to use temperature deliberately rather than accidentally.
6 min read ·
Safety
Fermentation Safety: What to Keep and What to Discard
Evidence-based rules for judging a batch — pH thresholds, mould identification, and the myths worth ignoring.
7 min read ·
Fermentation science
Koji, Enzymes and the Long Ferments of East Asia
How Aspergillus oryzae converts starch and protein into the amino acid backbone of miso, shoyu and amazake.
10 min read ·
Technique
Salt and Brine Calculations Without Guesswork
Brine percentage, dry salting and the arithmetic that makes vegetable ferments reproducible batch after batch.
6 min read ·
Fermentation science
Inside the SCOBY: The Microbiology of Kombucha
What the pellicle really is, which organisms live in the liquid, and why acidity — not the disc — keeps kombucha safe.
8 min read ·
Fermentation science
How Lactic Acid Fermentation Actually Works
The microbial succession, pH curve and salt chemistry behind sauerkraut, kimchi and every other vegetable ferment.
9 min read ·