Fig. 7From: Out of the blue: Vermeer’s use of ultramarine in Girl with a Pearl EarringBlue headscarf visualised with different non-invasive imaging methods. a Visible light image of blue headscarf showing three distinct zones: 1. highlight, 2. middle tone, 3. shadow, b MS-IRR infrared image (1900–2500 nm) [7], MA-XRF maps of: c–e lead, f calcium, g potassium, h RIS false colour image obtained at 750, 550, 450 nm [8]Back to article page