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Aging index (Aginsky)

The ratio of phenoxyethanol concentration in an unheated (cold) extract to its concentration in a heated extract from the same ink stroke; decreases from near 1 in fresh ink to near 0 in aged ink, providing an estimate of relative or absolute ink age.

Explained in

Ink Dating and Paper Examination: Fibres, Watermarks, Brighteners

Related terms

ASTM E2494 Dye-decay dating (LaPorte method)Machine direction (MD)Optical brightening agent (OBA)Plateau effect Rag paper Solvent-loss method Terminus post quem Watermark

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