50.2 MB (50.0 MB compressed)
5019 x 3494 pixels
42.4 x 29.5 cm ⏐ 16.7 x 11.6 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
False colour scanning electron micrograph of a scratch & sniff sticker showing the unscratched microspheres, which contain the scent. Scratch & sniff, a 3M company product, uses the same technology as the reuseable "Post-it" note pads (also 3M's). The glue is contained in tiny spheres (15-40 micrometers) of urea formaldehyde resin, which rupture under finger pressure. Not all the spheres rupture at once making the stickers reuseable. A common form of the scratch & sniff are tattoos, which are stuck onto the skin using the glue spheres on one side & similar scratch & sniff spheres containing perfume on the other. Magnification:X286 at 35mm size. Original is BW print H100/216.
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