How to Tell If Honey Has Gone Bad or Fermented

Honey that has absorbed moisture and begun to ferment may develop foam on the surface, slight bubbles, or a sour or alcohol-like smell. Properly stored honey keeps for a very long time; the main concern is usually moisture getting into the honey and starting fermentation. Honey’s low water content and high sugar concentration make it difficult for many microorganisms to grow, which helps it keep for a long time under suitable conditions. But honey left uncovered or stored in a humid place can absorb moisture from the air. Its water content rises, allowing natural yeasts to start fermentation. Honey becoming grainy and crystallized over time is not spoilage; gentle warming can make it flow again. It is important to distinguish these two conditions, crystallization and fermentation: crystallized honey can be eaten, while honey that has fermented, foamed, and turned sour has lost its freshness. Knowing the difference can prevent people from throwing out honey unnecessarily just because it has crystallized.

How Can You Tell If Honey Has Fermented?
Before using honey, look at it and check its aroma and taste to distinguish fermentation from normal crystallization. Whitish foam and small bubbles on the surface may indicate that fermentation has begun. A sour, yeasty, or slightly alcohol-like smell may also be a sign. A distinctly sour or sharp taste can indicate that the honey has lost its freshness. A bulging lid may mean gas has built up inside the jar. Crystallization alone is not spoilage; fermentation is suspected when it appears with foam and changes in smell or taste.

What Mistakes Should You Avoid When Checking Honey?
Some common mistakes can lead to unnecessary waste or improper use. Throwing away crystallized honey because it seems spoiled is one; crystallization is a natural change. Stirring honey with a wet spoon or one that has been used for eating can introduce moisture and increase the risk of fermentation. Boiling fermented, foamy, sour honey will not restore its flavor. Refrigerating honey speeds up crystallization; a cool, dry cupboard is generally a better place to store it.

How Should You Store Honey to Prevent Fermentation?
To keep honey from absorbing moisture, store it in a tightly sealed jar in a cool, dry cupboard away from direct sunlight. Use a clean, dry spoon each time you take honey from the jar to avoid introducing water or microorganisms. Properly stored honey keeps for a very long time. If honey crystallizes, gently warm the jar in hot water to make it flow again; do not expose it to direct high heat.

To assess whether honey may have fermented, consider foam, a sour or alcohol-like smell, and changes in taste together. Crystallization by itself is not spoilage and does not mean the honey should be discarded. Keeping the jar dry, sealed, and away from moisture is a practical way to help preserve honey. A dry spoon helps reduce the chance of introducing water.