(Received 25 January 1974; accepted 4 March 1974)
Published Online: October
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The use of Eastman Kodak Chromagram® sheet for the separation of the various dyestuffs used in the compounding of inks has already been documented . It has developed into one of the more useful techniques for the identification of inks. Both silica gel and cellulose Chromagram® sheets are now commonly used with a variety of eluent systems. Notwithstanding the variety of techniques available to the chromatographer, there are still certain mixtures of dyestuffs which do not yield clear-cut separations. The technique which will be reported here allows better separations to be made when used on these difficult mixtures.
Ink analyst, Janesville, Wis.
Stock #: JFS10475J