What is the difference between rhinoceros horn and common horn and yellow horn?

In ancient China, rhinoceros horn has a long history, and the different species of rhinoceros determine the color, shape and size of rhinoceros horn. Rhinoceros horn is composed of animal protein fiber keratin, which is curved in a straight line. Rhino's horns are naturally slender, and the apex angle is thick and short. The root of rhinoceros horn has a depression and the top of the horn has a groove, which is called "gully mound". Compared with common buffalo and yellow horn, rhinoceros horn is quite different in characteristics and essence. The shapes are similar and the differences are obvious. In figure 1, the order of the four corners from left to right is rhinoceros apex angle, nose angle, yellow angle and buffalo horn, with obvious external characteristics. Rhinoceros horn is moist and shiny; Cows and buffalo horns are dull. The silk lines of rhinoceros horn are linear and not adhered to each other, and the directional bending is oval and flat cone, and the width ratio of concave ridge is 2: 3. The yellow angle is a gyro-shaped cone with rough horizontal stripes; The buffalo horn is oval, flat, and the concave surface is pointed. Cattle and buffalo horn are a thin shell, which knocks the sound-image shell; Rhinoceros horn tissue is a tough whole. The composition, structure and physical and chemical properties are different. Figure 2 shows the bottom of four horns, arranged from left to right: buffalo horn, yellow horn and two rhinoceros horns. Leather protein tissue can be seen in the horn; Buffalo horn is black horny and impermeable; Rhinoceros horn is transparent and colored up and down. Cattle and buffalo horns are easy to soften and boil, and are easy to break under exposure and drying; The rhinoceros horn is solid whether cooked or exposed to the sun, and there are filiform longitudinal cracks at the bottom, which will re-close under suitable environment. Buffalo and ox horn slices have no hierarchical structure, and the cells are rough and loose under magnification and microscope. The gelatinous mixture of rhinoceros horn cells is dense, and the annual rings are as thin as cicada wings, which can be peeled off one by one after cooking and heating. Buffalo and yellow horn burn pungent smell, while rhinoceros horn burns horn incense. Tissue and color blend with each other. The mesh of buffalo horn and yellow horn is loose, and the rhinoceros horn is red, yellow, brown, blue and black, and it is transparent from top to bottom. Rhinoceros horn can be heated as a whole to change its shape, lengthen or expand, or it can be polished, dyed and carved into works of art, but the inner and outer corners of ordinary horn can not be heated, stretched or expanded, especially the inner corner can only be used as fertilizer or feed formula. Biological gems have magical effects. Rhinoceros horn is the most solid part of rhinoceros body, and it is a rare organic biological gem. It has magical effects of clearing away heat, reducing swelling, detoxicating and relieving convulsion. In China, rhinoceros horn has long been included in the Pharmacopoeia, which is rare and hard to find. It is difficult to find rhinoceros horn in pharmacopoeia and pharmacies now.