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Does the image contain glue tempera as Walter McCrone claimed?
According to Isabel Piczek, noted artist and art historian:
Dr. McCrone claims it was glue tempera which was the technique used on medieval paintings. This is highly incorrect. In the Middle Ages glue tempera was only used on the lesser kodex illustration. This medium cannot be used for realistic representations, as the Shroud's image would be, only for flat, decorative styles in art. The medium of fine art paintings in the Middle Ages was egg tempera.
Moreover, as Piczek notes:
n case of glomerates, the paint mediums surround the paint particles. The paint particles, always in the center of the glomerate are called the inner phase, the colloidal binder outside is called the exterior phase. The yellow substance supposedly found by McCrone inside of glomerates simply could not have been the paint medium.
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