What is Ferrous Sulphate heptahydrate and what is it
2012-6-28 · It is used a mordant for wool dyeing. Ferrous sulphate can also be used to stain concrete and some limestones and sandstones a yellowish rust color. Woodworkers use ferrous sulfate solutions to color maple wood a silvery hue. In horticulture it is used for treating iron chlorosis (yellowing of folliage caused by iron deficiency).
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