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Tattoo Artists Face a Grayer Palette in Europe - The New York Times

Are red ink tattoos safe? The expert opinion

UV Tattoo: What Is It? Safety and Choosing an Artist

Are there certain colors of tattoo ink that are bad for you? - Quora

Is it a good idea to get a red or blue ink tattoo? Or should I just stick with black ink? - Quora

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What's Up With Red Ink Tattoos? Are they Unsafe?

Can Tattoos Cause Cancer? The Health Risks of Inking

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Hazardous substances in tattoo inks still exceed EU limits, Swedish agency warns – Euractiv