Water treatment and agricultural chemicals, light micrograph
Water treatment and agricultural chemicals, polarised light micrograph. Ferric ammonium sulphate (FAS) is used in waste water treatment and as an etching agent in the production of electronic components. This is mixed with potash which is a potassium-rich salt which is essential for agriculture to increase plant yield. Magnification: x70 when printed 10cm wide., by KARL GAFF / SCIENCE PHOTO LIBRARY
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