The ingredients likely to cause allergies with an eyelash or brow dye are not the same ingredients found in a lamination product, so performing a brow lamination is safe as long as it is not followed by a brow dye. For all clients who have expressed sensitivities from previous treatments, it is best to check that they have had an ingredient allergy test performed by a dermatologist or allergist. There may be more than one ingredient to which they are sensitive and, of course, performing a patch test is mandatory.