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Knowledge / Luminescence / Accidentals

Luminescence Accidental: philatelic term for a luminescence deviation caused by accidental

Shifted Fluorescence: postage stamp with shifted fluorescence to another position as intended caused by accidental

Shifted Phosphorescence: postage stamp with shifted phosphorescence to another position as intended caused by accidental

Shifted Fluorescence Additional Printing: postal stationery with shifted fluorescence additional printing to another position as intended caused by accidental

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