Abstract
Nearly invisible, solvent-sensitive inks were found on several handcolored lithographs from an edition of Andy Warhol’s À la Recherche du Shoe Perdu portfolio, c. 1955. Research confirmed that the colorants were Dr. Ph. Martin’s Synchromatic Transparent Watercolors, tinctorially brilliant but highly fugitive water-based inks. Preliminary instrumental analysis (Fourier transform infrared spectroscopy, high pressure liquid chromatography) characterized the inks as mixtures of various synthetic dyes, some of them similar to ordinary food coloring. Accelerated light aging and color change calculations indicated that these inks are among the most light-sensitive media found on works of art on paper. Options for treatment of works incorporating these popular inks and suggested restrictive exhibition guidelines are presented.
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