1. Smell the smell of bran. Fresh bran has a faint wheat aroma, while inferior quality bran does not have this smell and may even have a smell; 2. Feel the bran with your hands. Moisture, dry bran, if you grasp it tightly with your hands and then loosen it, the bran will spread out immediately. If it spreads out slowly, it means that the bran contains a lot of moisture and is prone to mold; 3. Pat the unopened bags of bran with your hands. If white fine powder falls, it means that it is mixed with talcum powder; 4. Grab a handful of bran and spread it on your palm. If the bran is smooth and small, and has a green and yellow color, it must be mixed with rice bran.

Chemical analysis is used to determine the content of nutrients in bran, which can more accurately identify whether it is adulterated.

Test the crude protein content in bran. Generally, the crude protein content of pure wheat bran is between 14 and 16, while adulterated wheat bran is not within this range.

Testing the crude ash content of bran, the crude ash content of pure wheat bran is below 5, while the crude ash content of bran mixed with talcum powder is higher than this indicator.