It depends on the authenticity of the product, whether it is genuine or a regular manufacturer.
Use of carding machine and matters needing attention
First, insert the suction tube of the comb into the interface, then add a comb with black ointment to the bottle, tighten it with the comb and shake it well to use. When you comb the buttons with your fingers, the cream will flow out from the middle of the comb, and the dosage can be controlled at will. Comb your hair evenly and repeatedly as usual. Rinse with clean water.
Comb black is a kind of hair dyeing product which fills hair dye into a special comb and dyes hair black in the process of combing hair.
Note that this product is for external use only. Pregnant women and people with scalp wounds are prohibited. Please keep it out of the reach of children. Those with serious oily hair and more oil stains should wash their hair first and then dye their hair black with a comb. The comb head can be reused next time after use, and one comb is used for multiple purposes, which is shared by the whole family.