Fig. 5From: Van Gogh’s Irises and Roses: the contribution of chemical analyses and imaging to the assessment of color changes in the red lake pigments Roses. Reflectance imaging spectroscopy (RIS) analysis of the detail area shown at top left. Map (a) and diffuse reflectance spectra (b) of red end members. Map (c) and diffuse reflectance spectrum (d) of lead white Back to article page