Fig. 5From: The examination of Van Gogh’s chrome yellow pigments in ‘Field with Irises near Arles’ using quantitative SEM–WDXPlot of the amount of lead(II) sulphate versus the ratio of sulphur to the sum of the chromium and sulphur measured using WDX in the lead(II) sulphate and lead(II) chromate mixtures standardsBack to article page