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
Standard Oil of Colorado Standard Oil of Colorado Standard Oil of Colorado was chartered in Denver, Colorado in 1922. It was eventually rechartered under the name Standard Oil Company of Colorado in 1927 and began to sell stock in 1930. Standard Oil of Colorado was not related to the well known Standard Oil company and did not own any wells, refineries, or gasoline stations. It was sued in 1931 by Standard Oil of Indiana (which was interested in expanding its marketing influence into the Colorado area) over use of the "Standard Oil" name. By 1934, the courts ruled in favor of Standard Oil Company