Smell the smoke method to take a small amount of fish meal burning, pure fish meal emits a smell like the hair burning, if issued like the smell of burned grain, it proves that the fish meal is not pure.
The heating method will be about 30 grams of fish meal in the cup, then add 10-15 grams of soy flour and the right amount of water, covered and heated for 15-20 minutes, if odor when opening the lid, indicating that the fish meal mixed with urea.
Immersion method Put a small amount of fishmeal in a teacup, then add alcohol with a concentration of 95% and soak for 15-20 minutes. Add 1-2 drops of concentrated salt solution. If there is a deep red color, it indicates that there is wood chips.
Precipitation method The fishmeal was placed in a beaker, an appropriate amount of fresh water was added, and the supernatant was filtered out after stirring. Repeat this many times until only the sediment remains in the cup. Then remove the sediment from the cup and observe under a magnifying glass. If the fish meal is mixed with sand, it is easy to find.
Alkali dissolution reaction method Fishmeal was boiled in 10% potassium hydroxide solution. The fishmeal that could be dissolved was a true fishmeal. The insoluble portion was a fake fishmeal (ie adulterated fishmeal).
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