58.0 MB (4.8 MB compressed)
5140 x 3943 pixels
43.4 x 33.3 cm ⏐ 17.1 x 13.1 in (300dpi)
DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph (SEM) of the surface of coarse sandpaper. This sandpaper is technically known as grade 2.5 parchment glass paper, and the picture shows clearly the tiny glass grains which give it its roughness. Finer grades of sandpaper use even smaller glass particles. The paper base hidden beneath the grains is a high-quality product made from hemp or jute fibres. Magnification: x17 at 35mm size. Yellow tint. Original is BW print H100/74M. Reference: MICROCOSMOS, figure 9.10, page 180.
Model release not required. Property release not required.