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15 Boucher, The Toilet of Venus Blue overpaint 21 1/2" from upper left corner on front edge of painting. Thin section cross-section of paint mounted on polyester, viewed in reflected light. 1 - rust brown ground 30-80 µ, containing raw sienna (geothite). 2 - yellow ochre layer 20-60 µ, also containing white lead. 3 - pale blue layer 15-20 µ, containing white lead, and azurite. 4 - grey-brown layer 10-15 µ, containing white lead, ochre, carbon black 5 - blue overpaint 20-60 µ, containing cobalt blue, white lead. 6 - varnish layer 1-5 µ, thinly applied. Back |