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Is it safe to consume onions with black marks on them? Understanding health risks and ideal storage

Black marks on onions, often caused by black mould fungi, are usually superficial. These fungi thrive in warm, humid conditions, especially after harvest. While most affected onions are safe after peeling, deeper contamination can pose health risks. Proper storage in cool, dry, well-ventilated areas prevents mould growth, ensuring safe consumption and reducing food waste.