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120.7 MB (32.7 MB compressed)
7952 x 5304 pixels
67.3 x 45.0 cm ⏐ 26.5 x 17.7 in (300dpi)
KARL GAFF / SCIENCE PHOTO LIBRARY KARL GAFF / SCIENCE PHOTO LIBRARY
Potassium ferricyanide and salicin, light micrograph. Derived from the bark of the willow tree, salicin (formerly salicine) is used as an anti-inflammatory drug. It is used in small quantities as a food preservative and as an antiseptic in toothpaste. Copper sulphate is used in fertilizers as a fungicide, algaecide, root killer, and herbicide. It is also used as an antimicrobial and molluscicide agent. This is a crystalline film consisting of a mixture of the salicin and copper sulphate. Magnification: x70 when printed 10 centimetres wide.
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