The cocoon is spun by the silk moth caterpillar of a single silk fiber that can be up to several thousand feet in length. It's not that artificial silk is intrinsically evil, it's just that the whole point of using artificial silk in a rug is to save the cost of real silk. If the sample is real silk, the burning sample should ball to a black, crispy ash, and the smell should be of burning hair (you're burning protein, the same stuff your hair is made of). If the material was cellulose (ray 
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