Tattoo ink manufacturers are not required to reveal their ingredients. Even when the ingredients are listed, the 'recipe' is proprietary, so you won't know the proportion of one ingredient to another. Sources of those ingredients may change, too, so your safety may be in the hands of suppliers not intending their product be used in the human body.
Inks have been found to contain such chemicals as selenides, amines, plastics, automotive paints, and heavy metals (including lead, antimony, beryllium, chromium, cobalt nickel and arsenic). Carcinogenic, mutagenic or reproductive toxic effects are possible.
jpr: urine has been used as a color additive in primitive cultures!
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