1, gloss test
Operation method: Separate the cleaned hair and comb it flat and smooth. Put a mirror directly opposite, so that you can see the top of your head clearly. Make the light shoot down from the top of the head, forming a crown-shaped halo. Inference: The brighter the halo, the better the luster of the hair and the softer the hair.
2. Smoothness test
Operation method: comb the hair from top to bottom with a comb. Hold the tip of a handful of hair, rub it hard, and then see if the tip is bifurcated and broken. Inference: If the comb is always stuck in the same place, the hair in this place is the weakest and driest. Split fracture of hair tip is the beginning of hair fragility, which must be controlled and treated in time.