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There are several signs to determine if milk has spoiled without tasting it. Fresh milk has a sweet taste and a uniform appearance, while spoiled milk develops a sour smell, thickens, and may curdle. Proper refrigeration slows spoilage, but improper storage can accelerate it. Avoid smelling directly from the container; instead, pour some into a clean glass to check for sour odors. Look for texture changes, such as lumps or a sticky consistency, and check for bloated packaging, which indicates gas formation. Heating a small amount can also reveal spoilage if it curdles immediately. Understanding expiration dates is crucial, as 'use by' indicates safety while 'best before' relates to quality. After opening, consume milk within a few days, and remember that sour milk is not the same as yogurt or kefir.