Silk identify

1 silk feels a little bit cooling when you are touching that,but to polyester,it feels a little bit warm during summer.
2 burn the silk,you will see no flame,and it smells like burning hair,the ash is black particulate, which can be crumbled by hand easily.on contract,to polyester,when you burning,there will be flame,and leaving the hard plastic block of burning left on the burned part which cant be crumbled.

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