How to distinguish true and false fish meal
The standard fish meal is generally a powdery material with a uniform particle size and a slightly greasy appearance. A large number of loosely powdered fish muscle fibers and a small amount of bone spurs, fish scales, fish eyes and the like can be seen. The color is light yellow, yellowish brown or brownish brown. It has a loose touch, no agglomeration, no stickiness, no clumps, a rich grilled fish taste and a slight fishy smell. Overheated or high fat fishmeal will darken. If the color of the fishmeal is blackish red, the appearance is bleak, and the smell of burnt smell is a burnt fishmeal that causes spontaneous combustion due to improper storage. If fishmeal is dark brown, there is an oily odor that is a result of fat oxidation. If the fish meal has ammonia odor, it may be fatty degeneration in storage. The inspection methods are as follows: Floating method: Take a few samples into a clean glass, add 10 times water, and stand still after stirring. Observe the floaters on the surface of the water and sediments on the bottom of the water. If the water surface contains feather fragments or plant matter, rice husk flour, peanut shell Powders, wheat bran, etc., or sand and other minerals on the bottom of the water indicate that they are incorporated in such substances. Odor test method: According to the odor produced when the sample burns, whether to incorporate vegetal matter. When the authentic product is burned, it is the hair burning odor. If there is an aromatic smell of dried grains, it indicates the incorporation of vegetable substances. In addition, it is also possible to distinguish whether urea is incorporated or not based on the odor. Simply take a sample of 20 grams into a small beaker, add 10 grams of raw soy flour and a suitable amount of water, cover with a stopper and heat for 15 to 20 minutes. Remove the stopper. If ammonia odor can be smelled, then add urea. Bubble identification method: take a small amount of sample into a beaker, add the appropriate amount of diluted hydrochloric acid or white vinegar, if there are a lot of bubbles and issued a buzzing sound, indicating that doped with stone powder, shell powder, crab shell powder and other objects. Voice Evacuation System,Fire Broadcasting Control System,Voice Evacuation Control Panel,Fire Emergency Broadcast System LIAONING YINGKOU TIANCHENG FIRE PROTECTION EQUIPMENT CO.,LTD , https://www.tcfiretech.com