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,
Guqin strings for the archery 'bow'. It is important to distinguish from the two as they are often used to refer to the strings of the qin, or any other stringed instrument, sometimes together on the same page. However, etymologically, 『絃』 is the correct character to be used to refer to strings of the qin as the radical denotes, qin strings were made of silk (though probably etymologically incorrect for the modern metal-nylon strings). But for 『弦』, it probably denotes a string used on an instrument which requires a bow to play, such as erhu or violin. Maybe, 『弦』 can also be