My bag smells sour. Is it bacteria or yeast?

A sour, vinegary, or sweet-cider smell with slimy kernels suggests bacterial contamination. Yeasts often appear as oily sheens or bubbles. Discard contaminated jars or bags. To prevent: drain grain thoroughly, avoid burst kernels, sterilise at 15 PSI for adequate time, test LCs on agar before use, and minimise humidity contacting filters during incubation.

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