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Solvent-loss dating

An ink dating approach based on measuring the concentration of residual semi-volatile solvents (particularly phenoxyethanol in ballpoint ink) relative to a non-volatile reference; the ratio decreases with age as solvent evaporates or migrates, enabling estimation of minimum ink age.

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ATR-FTIR (attenuated total reflectance FTIR)D band and G band (Raman)ENFSI FIDE-WGESI-MS (electrospray ionisation mass spectrometry)Photodiode-array (PDA) detectorReversed-phase HPLCRf value (retardation factor)SWGMAT guidelinesVideo Spectral Comparator (VSC)

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