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The last non-deceiving mirror was manufactured in 1835, just before German chemist Justus von Liebig developed a process for silvering the rear surface of glass. No silvered mirror's reflection can be trusted; only polished discs of bronze or copper or small glass mirrors backed by lead, tin, or antimony neither flatter nor deceive.
"My looking-glass is a true friend, and neither flatters nor deceives": an illustration from The Quiver, 1888.
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