Although the tattoos are sometimes considered invisible in normal light, scarring from the tattoo machine in the application process may remain, and therefore still show. A UV tattoo becomes visible under blacklight, when it glows in colors ranging from white to purple, depending on the ink chosen. Colored ink is also available, where the ink is visible in normal light (as with a regular tattoo) but the ink will glow vividly under UV light. However, some UV inks are not as bright under normal light as normal tattoo ink and are considered not as vibrant.
No tattoo inks have ever been approved by the United States Food and Drug Administration because the FDA "has not traditionally regulated tattoo inks or the pigments used in them". Claims made that UV Tattoo Ink is "FDA Approved" when used for tattooing appear to be fraudulent; some UV-reactive tattoo inks may have been approved by the FDA for food-related purposes (such as marking food animals, like fish), but this is not the same as being "FDA approved" for use on humans for cosmetic purposes.
No tattoo inks have ever been approved by the United States Food and Drug Administration because the FDA "has not traditionally regulated tattoo inks or the pigments used in them". Claims made that UV Tattoo Ink is "FDA Approved" when used for tattooing appear to be fraudulent; some UV-reactive tattoo inks may have been approved by the FDA for food-related purposes (such as marking food animals, like fish), but this is not the same as being "FDA approved" for use on humans for cosmetic purposes.