Floatation: Take a few samples into a clean glass cup, add 10 volumes of water and let stand with vigorous stirring. Observe the floating surface of the water and sediments on the bottom of the water. If there are feather fragments or plant matter on the water surface, or sand and other minerals are found on the bottom of the water, the quality of the fish meal is not good.
Combustion method: According to the odor produced when the sample is burned, it is judged whether or not to incorporate a plant material. When the authentic product is burned, it is the odor of hair burning. If there is an aromatic smell of dried grains, it means that the plant material is incorporated. Detection Microscopy is the most commonly used method to identify most adulterants. For example, the outer surface of the chaff chips in the chaff flour has vertical and horizontal stripes; the outer surface of the wheat bran has fine wrinkles and some of them have wheat hair; the cotton seed cake has relatively thick cotton seed shell fragments, and the brown or white cross section of the cotton seed cake is ladder-shaped. Some surfaces are accompanied by cotton thread; rapeseed husks are reddish-brown or black, thin, with a net-like surface; shell powder particles are square or irregular, grayish-white, opaque or translucent; peanut shells are a bit like or striped Prominence; alkali-treated bone particles appear small holes.
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