It seems like everyone has a tattoo these days. What used to be the property of sailors, outlaws, and biker gangs is now a popular body decoration for many people. And it's not just anchors, skulls, and battleships anymore — from school emblems to Celtic designs to personalized symbols, people have found many ways to express themselves with their tattoos. Maybe you've thought about getting one. But before you head down to the nearest tattoo shop and roll up your sleeve, there are a few things you need to know.So What Exactly Is a Tattoo?A tattoo is a puncture wound, made deep in your skin, that's filled with ink. It's made by penetrating your skin with a needle and injecting ink into the area, usually creating some sort of design. What makes tattoos so long-lasting is they're so deep — the ink isn't injected into the epidermis (the top layer of skin that you continue to produce and shed throughout your lifetime). Instead, the ink is injected into the dermis, which is the second, deeper layer of skin. Dermis cells are very stable, so the tattoo is practically permanent.Tattoos used to be done manually — that is, the tattoo artist would puncture the skin with a needle and inject the ink by hand. Though this process is still used in some parts of the world, most tattoo shops use a tattoo machine these days. A tattoo machine is a handheld electric instrument that uses a tube and needle system. On one end is a sterilized needle, which is attached to tubes that contain ink. A foot switch is used to turn on the machine, which moves the needle in and out while driving the ink about 1/8 inch (about 3 millimeters) into your skin.Most tattoo artists know how deep to drive the needle into your skin, but not going deep enough will produce a ragged tattoo, and going too deep can cause bleeding and intense pain. Getting a tattoo can take several hours, depending on the size and design chosen.
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