Photography using light sensitive film or photographic paper through after the silver halide in the emulsion layer produced by the photochemical potential of the image.
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No. 2
In the photographic emulsion, due to physical or chemical light role in the individual crystals (usually silver halide) in the form of non-visible image, the negative of it becomes visible through the video imaging
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Hide trace
Hidden trace. Southern Emperor Jianwen, "as the man-made thin like Zhangba folder Zhu Gold Dredge": "Hui-day latent image, Tsz round should strike."