"A backlight is a great tool to use when inspecting antiques and collectibles. It can detect repairs, flaws, cracks and paint over’s on porcelains and paintings. It can also be used to detect new vs. old paint on items. It is not 100% fool proof but it is quite accurate most of the time. New paint will show as dark areas on a painting, or it will glow a deep dark violet. Old paint on an antique piece will not glow deep violet, it will be transparent or even change color. White will react with a bright purple, but old paint is more transparent.!"
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