According to the information in Baidu Library, it takes 12-24 hours to soak dried deer tendons, which can be extended to 48 hours in winter. The process of soaking hair is also very simple: first wash the deer tendon with clear water; Then soak in a warm water basin (keep the water temperature above 50 degrees). When there is a film on the surface of deer tendon, you can rub it continuously by hand, add a small amount of alkali or alum solution to continue rubbing until the epidermis dirt and outer film are removed, and then rinse it with clear water. By this time, the deer tendon should have softened. If it is the finished deer tendon, just tear off the transparent film of the epidermis.
Deer tendon is a kind of medicinal material, which is the tendon of limbs of sika deer or red deer in Cervidae. Efficacy: tonify kidney yang and strengthen bones and muscles. Indications: It is used to treat overwork, rheumatic joint pain, palace cold, impotence and nocturnal emission. Identification: dried deer tendon, slender strip, golden or brownish yellow, shiny and transparent. It is about 45 ~ 65cm long and about 1.5 ~ 2cm thick. The upper end is fleshy, and the lower part has 1 semicircular black hoof nail, and some have 4 small hoof bones; The toenails are slightly peeled off and have short brown or light brown hair. Tough and slightly fishy. Generally, red deer tendons are better. Sika deer tendons are dry and thin, and are rarely used. Those who live by themselves and are shiny and free from mildew, rot and moth are qualified; It better be short and strong. It is best to be dry, long, thick, golden and shiny.