Big red mushrooms have black spots on them, poisonous mushrooms do not. First: from the smell, the smell of big red mushrooms is fragrant, the smell of poisonous red mushrooms is pungent. Secondly, we can tell the difference from the size of the substrate. Red mushrooms are generally large in size, with thicker stalks and fragile caps that will bleed red juice when broken; poisonous red mushrooms, also known as red mushrooms, are similar in appearance to red mushrooms, but their substrates are generally smaller and their stalks are thinner than those of the large red mushrooms. The main differences between real and fake red mushrooms are shape, foot, color, taste and gill color. 1. Shape of real red mushrooms is dark red on the front of the cap, dark red in the center with horizontal wrinkles, fine and uniform gills on the ventral surface of the cap, pink feet, and rounded mushrooms (of course, we can't rule out the possibility that the shape of some red mushrooms has been damaged in the process of growth or harvesting) and the feet and gills are all red (Manzanita red is the most common type of red mushroom in the world). The surface of the stipe of a crimson mushroom should be pink and the foot of the mushroom should be hollow. As for those with white body and full texture, they are "cottage" red mushrooms. 3. Color identification: real red mushrooms will turn red even when they are in water. The reason why crimson mushrooms are red is because they have their own natural pigmentation, so they will turn red for sure. Only the water of fake crimini mushrooms will be dark red and have the flavor of dye, while the water of real crimini mushrooms will be pink and have the fragrance of mushrooms. After the crimini mushrooms are cooked, the color of the mushrooms will fade away as all the nutrients from the mushrooms are absorbed into the soup. The flavor of crimini mushrooms is in the soup.