The keel is a skeleton fossil of ancient mammals such as elephants, rhinos, and three-toed horses. Recently, it has been found that individual medicines are commercially weathered animal bones outsourced with talcum powder or charcoal powder.
The authentic keel is divided into three types: keel, five-flower keel and dragon tooth.
Keel: It is shaped like a beast and is thicker and different in size. The surface is grayish white or yellowish white, smoother, with textures and cracks, or with brown stripes and spots. Hard, uneven section, white, delicate as fine. The joint is enlarged and has several honeycomb holes in the section. Strong moisture absorption. Odorless, tasteless.
Five-flower keel: It is irregularly blocky and varies in size. The surface is white with a blue-gray and brown-red pattern. The depth and thickness are different. It is slightly like a marble stripe with a smooth surface and occasional small cracks. Hard and brittle, easy to peel off and shatter. It is highly hygroscopic and has a suction on the tongue. Odorless, tasteless.
Dragon tooth: a tooth fossil of ancient mammals, rhinoceros, and three-toed horses. Completely toothed or broken into irregular blocks. Mainly for canines and caries. The canine teeth are conical, apex curved and pointed, with a diameter of about 3 cm, and are often hollow near the tip. The molars are cylindrical or square-shaped, with a thinner end, slightly curved, and many different shades. The surface is white, blue-gray or dark brown, rough or visible with shiny enamel. Hard, uneven section, rough. It is hygroscopic. Odorless, tasteless.
The fakes are generally smaller or irregularly shaped than the keel bones. The white powder is attached to the surface, and the bone part is opened. The cross section is mostly honeycomb-shaped (which is weathered), and the tongue is non-hygroscopic. force.
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