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Polyene
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==Optical properties== Some polyenes are brightly colored, an otherwise rare property for a hydrocarbon. Normally alkenes absorb in the [[ultraviolet]] region of a [[Ultraviolet-visible spectroscopy|spectrum]], but the absorption energy state of polyenes with numerous conjugated double bonds can be lowered such that they enter the visible region of the spectrum, resulting in compounds which are coloured (because they contain a [[chromophore]]). Thus many natural [[dye]]s contain linear polyenes.
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