For the most part, natural human hair is a better choice for wigs and hairpieces despite it will be a little harder to collect. If you are confused at the judgment of the material when considering for purchase, there are some ways following to help you.
Burn test: Put a strand of hair into burning flame. If it smells like plastic and no powder left after burned, it is synthetic hair. Instead, as human hair is made of protein, after burnt, the ash will be powder and smell just like burning meat.
Texture: Compared with synthetic hair, human hair will be more smoother, shinier and softer. Each strand of natural hair has scales. That means you get different feelings when you pull it in different directions. Synthetic hair is smooth whichever way you rub it.
Color: If the hair has subtle changes of color and highlights, it is most likely natural. The color acquired through exposure to natural light, which is extremely difficult to obtain from artificial ways.
Wave: Whether you buy straight hair or curly hair, real human hair will be curly and elastic after washing .It tend to be the natural state, not very stiff. On the other hand, the synthetic hair will always maintain the same appearance as before.