Realgar and orpiment, arsenic sulfide pigments used in historic paints, degrade under the influence of light, resulting in transparent, whitish, friable and/or crumbling paints.

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The seventeenth-century artist Frans van Mieris was masterful in the realistic rendering of different materials, like satin, velvet, fur and metal. His work could well have been a source for fabrics and other materials for the slightly younger Willem Beurs’s 1692 treatise on painting. This paper will show how acute Van Mieris observations were in depicting these materials, and the role that reflections play in our perception of their realism.

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