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Answer:
First, look on the fabric to see if it has a tag of some sort that says its type. If there is no such tag, look in the bin you found it in and see if, on the bin, there is a sticker that tells you which type of fabric it is. If there is no such sticker, ask the store manager or one of the employees what type of fabric it is. If they cannot tell you, take it to a professional fabric store.