Which of the following method is used to demonstrate blackening and tattooing of skin and clothing?: (A) Magnifying lens, (B) Luminol spray, (C) Ultraviolet light, (D) Infrared photography
Answer is D. Infrared photography is used to detect tattoos on cloth or skin. Ref: Dating and Age Determination of Biological Materials By Michael R. Zimmerman, John Lawrence Angel, Page 170