Tattoo ink isn't really ink. It's a combination of pigments suspended in a carrier solution. Unfortunately there is no real way to know what is in tattoo ink, as manufacturers of the stuff are not required to label the ingredients. Also, recipes for certain colored inks are secrets that are as closely guarded as the recipe for Kentucky Fried Chicken.
It is known that most tattoo inks are created from metal salts, although some may consist of vegetable-based pigments. Given that the ingredients in most tattoo inks are unknown even to the tattooist, it's difficult to predict if you could have an allergic reaction to the ink. Reactions are rare but it is something to consider if you have especially sensitive skin. The most common reaction is an itchy raised appearance to skin that can take as long as a week to show itself.
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