[{"text_idx": "#000006", "text": "Industrially, ferrous sulfate is mainly used as a precursor to other iron compounds. It is a reducing agent, for the reduction of chromate in cement."}, {"text_idx": "#000007", "text": "Ymunwch a\u0302 ni a bod y cyntaf i wybod am ein cynhyrchion diweddaraf."}, {"text_idx": "#000008", "text": "defnydd sodiwm bicarbonad ar gyfer"}]