<prompt> Gradual lightening blue black colour shift in a tattoo is called:Tyndall effectHalo effectWashing outLeaching  <response>: Changes in tattoo maturation Halo effect - extrusion of pigment on deposition near follicle Washing out leachingpigment migration-carrying away of pigment by macrophages on deep inseion Ref: Textbook of dermatosurgery cosmetology, satish S savant, E-2,P-338. 