Ferrous sulfate-based reducing agent, useful for reducing allergenic chromate in building materials, e.g. cement, has ratio of mono-, tetra- and heptahydrates controlled by adding water to improve effectiveness
摘要
<p>In a reducing agent (A) based on ferrous sulfate (FeSO4) (I), the ratio of monohydrate to tetrahydrate to heptahydrate in (I) is controlled by addition of water.</p>
