Bought milk (no boiled or microwave oven heated) into a clean transparent goblet, then slowly tilt the glass, if there is a thin film on the glass wall, and don't hang cup, easy water rushed down, that is the raw material of fresh milk.The milk is in a short period of time is sent to the factory, and the total number of bacteria is very low.If the milk on the glass membrane uneven, even there are visible to the naked eye small particles on the glass, and not easy to clean, so that's proves the milk is not fresh any more.
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