Scalp Micropigmentation (SMP for short) is similar to traditional tattooing using permanent ink, but it is diluted depending on the required finish / colour, and is gently tapped in to the scalp. The depth of ink insertion has to be the same however, being tattooed just under the top layer of the skin, so the ink is retained. However, the technician needs to be careful not to go too deep or it won’t look natural.