Iron(II) sulfate was used in the textile industry for centuries as a dye fixative. It is used historically to blacken leather and as a constituent of ink. The preparation of sulfuric acid ('oil of vitriol') by the distillation of green vitriol (Iron(II) sulfate) has been known for at least 700 years. Together with other iron compounds, ferrous sulfate is used to fortify foods and to treat and prevent iron deficiency anemia. Constipation is a frequent and uncomfortable side effect associated with the administration of oral iron supplements. Stool softeners often are prescribed to prevent constipation. Ferrous sulfate was used in the manufacture
Pure Oil Pure Oil Pure Oil Company was an American petroleum company founded in 1914 and sold to what is now Union Oil Company of California in 1965. The Pure Oil name returned in 1993 as a cooperative (based in Rock Hill, South Carolina since 2008) which has grown to supply 350 members in 10 Southern states. Three companies operating in the United States have used the Pure Oil name. The first began as a group of independent oil refiners, producers, and pipeline operators, in fall 1895 in Butler, Pennsylvania, with headquarters in Pittsburgh, although it was incorporated in New Jersey. Pure