Word: beeswax
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Dates: during 1951-1951
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...experts began with a painstaking study of the painting's twelve panels with microscope and X-ray photographs. Then they impregnated the surface with beeswax, and flattened out blisters with warmed spatulas. With mild solvents, they removed centuries of varnish (sometimes twelve layers deep) and retouchings, and they scrupulously avoided doing any retouching of their...