7 Labrosse atelier, Virgin and Child Photomicrograph in reflected light of cross-section of white paint. 1 - coarse gesso-like material containing carbonate, 2 - white lead, 3 - whitish grey layer, 4 - thin grey layer visible only by fluorescence (ultra-violet), and is probably dirt or grime, 5 - grey layer of overpaint, 6 - white enamel paint, surface overpaint. (1 µ - micron, equivalent to 1 / 25,000 inch approximately)

7 Labrosse atelier, Virgin and Child
Photomicrograph in reflected light of cross-section of white paint.
1 - coarse gesso-like material containing carbonate,
2 - white lead,
3 - whitish grey layer,
4 - thin grey layer visible only by fluorescence
(ultra-violet), and is probably dirt or grime,
5 - grey layer of overpaint,
6 - white enamel paint, surface overpaint.
(1 µ - micron, equivalent to 1 / 25,000 inch approximately)

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