Wave: Whether you bought it straight or curled, real human hair will always curl up when wet; it turns to its natural state. The hair should also have some motion, a ‘bounce’ to it and should not be stiff.
Tangle: Real human hair will tangle, but just a little. The longer the hair, the more likely it is to tangle especially at the back of the neck, but this should not worry you much. If the tangling is excessive, be wary.
Shedding: This too, can happen with human hair but if it is excessive, it is not genuine. Shedding should only be a few strands when you comb through. Sealing the wefts of the weave will ensure the hair stays on. Comb the weave with a wide tooth comb from the tips to the roots to reduce shedding.
Colour: If the hair has subtle changes of color and highlights, it is most likely natural. Real hair acquires color through exposure to natural light, which is quite difficult to achieve through artificial means. If a vendor asks you what color of hair you want, then that is a sign it is not real. Human hair comes in the natural color, which is either black or brown. You can always dye it later if you want a different color.
Burn test: Simply cut a strand of hair and put it on a burning flame. If it melts slowly into a ball instead of burning, smells like rubber and produces black smoke, it is not human hair. Human hair will immediately catch fire, burn nearly instantly curling into a little ball, and smell like burning hair. Human hair burns, synthetic melts.
Bleaching: When you bleach human hair, it lightens very fast depending on the grade. If it is fake, it will most likely burn.