63.3 MB (4.0 MB compressed)
3840 x 5760 pixels
32.5 x 48.8 cm ⏐ 12.8 x 19.2 in (300dpi)
MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Ferrous sulphate crystals. This iron salt can be used medicinally to treat iron deficiency. It is also used as a colourant in ink and dyes, in horticulture, and in gold refining. It is produced as a by product of pickling steel in sulphuric acid.
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