I've never had a allergy test but have had allergic reaction. But that was to cheap ink and one that was pink. But if you ask your tattooist they'll do a 'dot-test' on you. Tattoo a tiny unseen dot on you and then check it a day or so after to see if you have a reaction. They'll tattoo a singular dot on an unseen area of skin. After the recommended amount of days, they will check for a reaction or irritation. If these are found, you're most likely allergic to tattoo ink.