Tattoo ink
Modern tattoo ink is derived from a synthetic compound called Acrylonitrile
butadiene styrene. This plastic comes in almost all shades, yet skilled
artists can mix different pigments to create a custom palate colors.
Artists use a special gun (which looks and sounds similar to a dentist
drill) to deposit tattoo ink about a millimeter into the skin –
beneath the epidermis layer into the dermis. The dermis has more stable/permanent
cells where the ink will not smear or rub off.
Although the FDA has approved most kinds of tattoo ink, they do not
regulate it. If the artist uses clean and sterile equipment, there should
be no concern about infection. However, there is a small amount of people
who are allergic to the ink (especially red or green pigments) –
performing a test patch is often recommended.