These can be based on at least 20 different iron compounds, and sold under a wide range of brands. (sciencedaily.com)
Synchrotron X-rays are useful for analysing wrecked historical ships, where they are used to determine the quantities, location and chemical state of sulphur and iron compounds in microscopic detail. (scienceinschool.org)
A mixture of iron compounds and carbon gives off electri (sciencenews.org)