12. Forged documents are detected by A.Ultraviolet rays B.Infra-red rays C.Beta rays D.Gamma rays
Option A Solution: Old postcards, books, signs, photos and other paper products made before the late 1930s rarely glow under a black light. Chemical bleaches and dyes used in modern papers will fluoresce under ultraviolet light. Knowing this helps to detect forged documents and distinguish reproductions in all types of ephemera.