A method for the detection of egg white in binding media by immunofluorescence was tested on laboratory samples. Although the fluorescence was weak, results were found to be reproducible. Tests were then carried out on a series of ancient paintings and polychromies dating from the twelfth century onwards. Some of these samples, including certain blues from Van Eyck's Mystic Lamb, gave a positive response for egg white.
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Kockaert et al. (1989) studied this question.
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