Fig. 2
From: A pilot study of solvent-based cleaning of yellow ochre oil paint: effect on mechanical properties
Secondary electron SEM images at 150 × magnification, of 21 month old Yellow Ochre oil paint films, after heating at 30 °C for 46 h following a untreated sample, b 24-h immersion in deionised water, c 24-h immersion in Shellsol D40, d 24-h immersion in D5 silicone solvent