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Over time hazy films, termed "ghost images", may appear on the inside surface of the protective glass which, arts ultimately, impair proper viewing of the painting. To enhance visibility, these so-called "ghost images" are periodically removed by museum preparators using glass cleaners. Studies by Williams at the Canadian Conservation Institute, using infrared spectroscopy, determined that ghost images consist almost entirely of palmitic acid (Williams 1989). To explain his arts findings, Williams speculated that volatile arts ketones are released by the paint, some of which undergo oxidation on the glass surface to form palmitic acid. Somewhat later, Michalski postulated another explanation for Williams's findings, that free fatty acids simply may evaporate from the painting and condense on the glass. He reasoned that enrichment of the image in palmitic acid occurs because the boiling point of palmitic acid is much lower than that of stearic acid (Michalski 1990).
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