50.2 MB (5.7 MB compressed)
3712 x 4724 pixels
31.5 x 39.9 cm ⏐ 12.4 x 15.7 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Post-It. Coloured scanning electron micrograph of the sticky surface of a "Post-it" sticker. The bumps are resin spheres containing glue embedded in the paper. The spheres, 15-40 micrometres in diameter, are made from urea formaldehyde resin, which ruptures easily under finger pressure. Each time the notepaper, with its sticky strip, is pressed to a surface a few spheres burst and release a film of glue. The stickers may therefore be reused many times, until finally all the spheres of glue have been used up. Magnification: 180 at 6x7cm size.
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