This is the opposite of most inks which usually extract slower as the ink ages.
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The R-Ratios technique easily distinguished the age of these inks.
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Pvc Ratio Method A dye ratio comparison is done using the following steps: 1.
Remove samples from the paper, or if the spots for the Rratio are along the bottom of the plate, the dye ratio analysis can be done without taking more samples.
Speckin Abstract: This paper describes an independent assessment of the reliability of techniques currently in use in the United States for determining the relative age of writing inks.
Techniques evaluated include the R-Ratio and Percent Extraction techniques, the Dye-Ratio method and the Accelerated Aging technique.
Opinions of ink dating chemists, both government and private, differ on the reliability of the above described ink aging methods.