Fig. 5From: The role of SVOCs in the initial film formation and soiling of unvarnished paintingsOptical microscopy image, in raking light and × 200 magnification, of a Teflon membrane filter after twelve months exposure. The most typical particle types observed included: a small, dark, near-spherical particles, b larger, brighter, near-spherical particles, and c large, fibrous particlesBack to article page