You probably know that tattoos work by injecting ink into the skin, but do you really know the process behind it? Modern tattooing uses a tattoo machine also known as a tattoo gun to inject a colored ink into the second layer of skin called the dermis, it does this by rapidly moving a sterilized needle up and down just enough to pierce the skin, each time the needle pierces the skin it injects a small droplet of ink into the second layer of skin called the dermis.

Why are tattoos permanent?

Unlike the top layer of skin, dermis does not shed on a regular basis, so once the ink is in the dermis it will most likely stay there. Though tattoos are not really permanent they do fade and lose darkness over time, but they tend to out last us, so we regard them as permanent.


A lot of the inks today are made from metal, and sometimes people have allergic reactions to these metals located in the ink. Here’s a list of common inks and what metal they are made from so you know what colors to stay away from in case you’re allergic to it.

Brown: Is made from Cadmium Salts

Yellow: Is made from Cadmium

Black: Is made from Carbon

Blue: Is made from Cobalt

Green: Is made from Chromium

Purple: Is made from Manganese

Red: Is made from Mercury