Non-fresh meat: Meat is gray-white or light green, without luster; appearance is wet and sticky; flesh is soft and inelastic.
Infresh animal viscera: dark red or green, soft and inelastic. It has peculiar smell and sour taste.
Chemical fertilizer bean sprouts: bean sprouts with short or rootless roots and blue sprouts. When bean sprouts are broken, water will come out, and some still have the odor of fertilizer.
Fake pepper powder: light red color, less pepper seeds. If brewed in hot water, the high quality pepper powder is yellowish, there are many pepper peels and seeds, while the fake pepper powder is light red.
Formaldehyde-diffused aquatic products: Fresh and normal aquatic products have a fishy smell, but the aquatic products after formaldehyde-diffused look very bright, some color will be too white, the taste is hard.
Excellent and inferior sugar: White sugar is white and bright with luster; secondary white sugar is slightly yellowish; inferior white sugar is yellowish, dark and dull. You can also check the taste of white sugar, take a few samples and taste them directly, then mix them into 10% sugar solution to try. Good white sugar has pure sweetness; the taste of inferior white sugar is basically normal; the taste of inferior white sugar is not pure or has foreign odor.
Real and fake duck blood: Real duck blood is delicate and tender, if using chopsticks are fragile, but fake duck blood is relatively rough, using chopsticks are not broken; after drying a piece of duck blood with napkin paper, if it becomes as tough as rubber mud, it is false duck blood; Real duck blood has dark color, good elasticity, and a strong fishy smell. Generally speaking, the blood of fake ducks is colloidal, not easy to break, its color is similar to red brick, and most of its cross section has honeycomb-shaped holes, while the blood of real ducks is dark red, with sparse holes and is very fragile.
