Comparison of Ink Writing on Documents by Means of Paper Chromatography

Abstract

the close of the war (1946-1949) Mr. Brackett held an appointment as a staff analytical chemist in the Standard Oil Company of California's laboratory. Lowell W. Bradford is Director of the Laboratory of Criminalistics, Santa Clara County District Attorney's Office, where he carries on work in the field of general criminalistics. Mr. Bradford is also a graduate of the University of California, Berkeley, and has previously contributed an article on blood alcohol to this Journal (May-June, 1950).-EDITOR. The examiner of questioned documents is frequently faced with a problem involving ink. Ink identification has many facets, and the problems which arise may have many forms which may require different approaches to a solution. Among document examiners it is generally understood that ink is usually a multicomponent mixture possibly con-taining a permanent factor such as iron gallotannate or carbon and one or more dyes to give desired color effects. In modern inks, the variety of colors or dyes which may appear in a particular ink is sometimes

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