ALEXANDER TSIARAS / SCIENCE PHOTO LIBRARY ALEXANDER TSIARAS / SCIENCE PHOTO LIBRARY
Coloured image produced by an airport X-ray scanner. Colour coding reveals a book (grey object, top left), a block of paraffin (light grey, bottom right) and a block of Semtex plastic explosive (yellow, bottom left). Other items such as a pistol, a hand grenade and a telephoto lens are clearly visible. These scanners, typified by the Heimann Hi-Scan seen here, allow security officials to detect plastic explosives easily. Explosives such as Semtex are used in a variety of terrorist bombs, including the one which killed 270 people in a Boeing 747 over Lockerbie, Scotland, in December 1988.
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