Silk tie and polyester tie can't be seen by hand or naked eye because of the improvement of post-processing skills. So the usual difference is the 2 way is to use fire. Usually you can turn out a little cloth in the sewing line of the necktie's small head, and burn it with a lighter to make it clear. It is polyester silk that meets the flame and becomes powder, that is, silk, so the comparison is simple and commonly used method. Note that only burn the thread before you can burn the tie is not good!
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