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Dye-decay dating (LaPorte method)

An ink dating method that uses HPLC-PDA to monitor the relative concentrations of specific dye components and their degradation products; the ratio of degradation products to parent dye increases with age, providing an ageing index for ballpoint inks.

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Aging index (Aginsky)ASTM E2494Machine direction (MD)Optical brightening agent (OBA)Plateau effectRag paperSolvent-loss methodTerminus post quemWatermark

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