Human hair wigs are softer, longer-lasting and more comfortable than synthetic wigs. so how to test the quality of a wig? just following the method below.Hold a strand of hair in the tweezers. Put a lighter flame to the end of the hair to ignite it and then pull the flame away.Pay attention to the smell and the way the hair burns. Human hair has a distinctive sulfuric odor. When it is lit, the flame will flicker out quickly unless you continue burning it and the ash will be powdery.