Method of determining the age of ink having time dependent chara

Details Method of determining the age of ink having time dependent chara Method of determining the age of ink having time dependent chara

1995-07-20

1997-02-04

Evans, F. L.

Optics: measuring and testing

By shade or color

356 71, 356425, 356300, 250226, G01J 3427, G01J 350

Patent

active

056004435

ABSTRACT:
A method and ink composition are disclosed that utilize two mechanisms for the purpose of indicating the approximate age of an ink that has been deposited on a writing surface. The first mechanism relates to detecting color shifts of pH sensitive compounds in the ink as the result of the evaporation of certain acidic or basic chemicals thereof. The second mechanism relates to the oxidation of compounds in the ink. Spectroscopically generated curves are plotted as the ratio of reactants to products, versus time. The spectral characteristics of the ink are determined in units of percent reflectance of the active compounds in the ink so that the age of the ink can be computed by reference to known reaction rates. A plurality of dyes having differing reaction rates may be added to the ink to enable precise measurements to be made over different time intervals.

REFERENCES:
Cantu, Analytical Chemistry, vol. 63, No. 17, Sep. 1, 1991, pp. 847A-854A.

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