Figure 4From: The Louvre Crucifix by Giotto – Unveiling the original decoration by 2D-XRF, X-ray radiography, Emissiography and SEM-EDX analysisSEM-FEG secondary electron images of the two gildings. a shows the modern leaf with a ca 200 nm thickness. b shows the Zwischgold leaf composed of a 100 nm Au layer on top of a 600 nm Ag layer. The latter has turned into silver chloride. Aggregates on top of the gold layer are made of the same material and come from the altered layer (© C2RMF Patrice Lehuédé).Back to article page