Silk tie and polyester tie now because of the improvement of post-processing skills, some can no longer be touched by hand or naked eyes to see the difference. So the usual difference is the 2 way is to use fire. Usually you can turn out a little bit of cloth in the small end of the tie sewing line. It can be clearly burned with a lighter. It is polyester that meets the flame and becomes hard. It is silk that becomes powder. This is a simple and common method. Note that only burn the thread before you can burn the tie is not good!
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