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iron sulfate
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Word History and Origins
Origin of iron sulfate1
First recorded in 1875–80
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Example Sentences
Both correspondents used common gall ink made from iron sulfate, but different inks contain different proportions of trace elements, depending on the source, Michelin says.
From Science News
Vitriol is copper or iron sulfate, saltpeter is potassium nitrate, and alum is an aluminum sulfate salt.
From Project Gutenberg
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