What is ink dating

In cases where known dated writings are not available for comparison with questioned inks, accelerated aging (heating the ink to induce aging of the ink) can sometimes be used to estimate the age of ink using any or all of the above described techniques.Iron-based inks can be dated by measuring the migration of iron along the fibers of the paper by Scanning auger microscopy.Ballpoint inks made before about 1950 used oil-based solvents such as mineral oil, linseed oil, reci-noleic acid, methyl and ethyl esters of recinoleic acid, glycerin monoricinoleate, coconut fatty acids, sorbi-tal derivatives, and plasticizers such as tricresylpho-sphate.Modern ballpoint inks (post-1950) are referred to as glycol-based inks, because of the common use of ethylene glycol or glycol derivatives as a solvent for the dyes.

Ballpoint inks consist of synthetic dyes (sometimes carbon or graphite is also added for permanence) in various glycol solvents or benzyl alcohol.These pens contain a pressurized feed system instead of gravity flow.The physical characteristics of these inks are quite different from the standard glycol based ballpoint inks.There are two types of fountain pen inks: (1) iron-gallotannate type and (2) aqueous solutions of synthetic dyes.Modern inks of type (2) contain synthetic blue dyes to provide an immediate blue color to the ink which gradually turns black after oxidation on paper.

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