Tattooing is a form of body art accomplished by injecting ink into small, deep holes made in the skin. Most tattoo artists use an electrically powered, vertical, vibrating instrument to inject the tattoo pigment. The instrument injects pigment at 50 to 30,000 times per minute into the second layer of skin (the dermis), at a depth of 1/64 to 1/16 of an inch.
A single needle outlines the tattoo and the design is then filled in with five to seven different needles in a needle bar.