How long can the thread carving used for the threading needle last?

Line carving is not permanent. Because the thread used for thread carving will slowly absorb over a period of time. There are three main types of lines used in line carving, namely zigzag line, spiral line, and smooth line. These threads are generally absorbed in about six months, so the effect of most people's thread carving can last for six months, and some people can last longer, even one to two years. To sum up, thread carving can maintain the effect of six months to a year.

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