50. Which of the following is not true according to this passage? (A) The Egyptian blue has been widely used by law enforcement these days. (B) The Egyptian blue was found in paint on ancient statues, coffins, and tomb walls in Egypt. (C) Fingerprints glow as the pigment is brushed on and photographed with a filter sensitive to its near-infrared radiation. (D) The pigment is marketed in the form of powder.