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Heritage Science
Fig. 10 | Heritage Science

Fig. 10

From: Use of standard analytical tools to detect small amounts of smalt in the presence of ultramarine as observed in 15th-century Venetian illuminated manuscripts

Fig. 10

XRF analysis and microscopic examination of Saint Lawrence. a XRF counts (peak area) for cobalt K-alpha in an XRF linescan of the light blue foliage and dark blue collar. The red line in each detail image indicates the linescan location. XRF linescan parameters: 60 um X-ray spot size, 100 μm step size, 100 s collection time per spot, 50 kV, 200 μA, Rh excitation. b Example of the XRF fit in the region of the Fe and Co K-lines for the first spectrum in the linescan of the collar. c Magnified examination shows fairly finely ground blue particles within the blue paint

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