Black and dark blue tattoos can be removed particularly well with the ruby laser and Nd:YAG laser, whereas the frequency-doubled Nd:YAG laser (KTP) is used for red to yellowish tattoo colors. The ruby laser works more effectively on green colors. Picosecond lasers - depending on the equipment - work very well on all colors of a tattoo. In addition, the latter have the advantage that they work with light pulses about 100 times shorter than the other lasers mentioned. As a result, the ink is hardly heated at all and is torn into smaller particles that the body can break down more quickly and with fewer side effects.