Discussion
The writing on charred document can be restored by :
Answer: C
The writing on a charred document can be restored by infrared photography. Burnt paper is black in visible light, but the ink and the paper reflect and absorb infrared radiation differently, so the writing may show up when photographed with infrared film or a filter. Reflected visible light and ultraviolet rays do not give the contrast needed on carbonised paper. So C is correct and D is wrong.
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