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".[2] 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 UV tattoo ink is also many times more expensive than regular tattoo inks. Some people have had reactions to ingredients in the ink (especially to phosphor based tattoo ink),[3] ranging from minor itching to dermatitis. Several UV inks are suspected carcinogens and allergens and at this time no research has been conducted into the side effects of long term exposure. Although many people who have received UV or blacklight tattoos have had physical effects on the skin, any ink could cause a reaction. This can be a result of not protecting the tattoo from UV rays within 3 months of receiving the tattoo process or by using scented cremes or lotions on the tattoo area. This can damage the ink, causing it to become a normal ink color in all light. In time, it may also not glow in black lighting. Blue UV inks are known to yellow or turn slightly brown with sun exposure.[citation needed] Black UV inks are known to become colored in all lighting. Therefore, it might permanently appear as a regular tattoo.