Proven almost universally deployable in practice, the wavelengths of Ruby lasers (694 nm) are strongly absorbed by dark colours in general as well as green coloured pigments. In addition, the strong absorption of the ruby laser beam by the melanin of the skin pigment, these devices are also used to treat natural pigmented lesions. Generally, patients tolerate the treatment without the use of an anesthetic. In rare cases, a local anesthetic is used.
The Nd:YAG laser (532;1064 nm)’s light is greatly absorbed by blue, red, and dark colours. This laser can be used to remove lesions that are benign pigmented.
Either of the laser’s wavelength, laser light is absorbed specifically by the tattoo’s colour pigments. The energy from the laser is transferred and from the connective tissue, ink particles are fragmented. The fragmented particles are then degraded both lymphatically and epidermally. Immediately after treatment, the irradiated area of the skin will appear whitish for 10 to 20 minutes. A slight crust will form on the area that will slough off after a week or two. Commonly, the removal of a tattoo requires several sessions at intervals of several weeks between them.