A tattoo is a permanent mark or design
made on the body when pigment is inserted into the dermal layer of
the skin through ruptures in the skin's top layer. Modern-day tattoos
are applied by using an electric tattoo machine with needles that
rapidly puncture the skin with an up and down motion not unlike that
of a sewing machine.
Lasers are used to destroy
the pigments in the tattoo. Tattoo ink is a colored liquid and when
the laser attracts to the color it crystallizes the ink...making it a
hard substance. The body recognises this crystal as a foreign object
and either digests (metabolises) it or pushes it out through the skins
surface, much like a splinter. At the same time trying to keep
scarring to a minimum.