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Data from this study were able to facilitate comparison of blue paints from two different paintings and confirm their co-provenance consequently determining the relative production date of a separate painting of previously unknown age.
It was also ground up to make bright blue paints used by Italian Renaissance artists.
The MCR-ALS with image contrast enhancement could not separate the two blue paints either.
MCR-ALS was not capable however of separating the small Cu and Fe contributions and extract two different blue paints.
These were mixed in 90:10 ratios with cochineal, viridian and cobalt blue paints, and with bone black in several ratios (Fig. 3b).
The Cu and Fe maps suggest the presence of two different blue paints, one richer in Fe and a second one richer in Cu though the concentration of these elements is small.
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