Catgut down to the desired diameter using a centerless grinder. After drying and polishing, workers bleach and disinfect the strings using sulfur dioxide, dye them if necessary, and sort them into sizes. Catgut sutures are normally treated with a chromium salt solution to resist body enzymes, to slow the absorption process, and are called catgut chromic sutures—whereas untreated catgut sutures are called catgut plain sutures. Catgut Catgut is a type of cord that is prepared from the natural fibre found in the walls of animal intestines. Catgut makers usually use sheep or goat intestines, but occasionally use the intestines of cattle,
Jinghu (instrument) Jinghu (instrument) The jinghu (京胡; pinyin: jīnghú) is a Chinese bowed string instrument in the "huqin" family, used primarily in Beijing opera. It is the smallest and highest pitched instrument in the "huqin" family. Like most of its relatives, the "jinghu" has 2 strings that are customarily tuned to the interval of a 5th which the hair of the non-detachable bow passes in between. The strings were formerly made of silk, but in modern times are increasingly made of steel or nylon. Unlike other "huqin" instruments ("erhu", "gaohu", "zhonghu", etc.) it is made of bamboo. Its cylindrical soundbox is covered