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
Today Is Yesterday Today Is Yesterday Today Is Yesterday is a 2002 compilation album by English folk/rock singer-songwriter Roy Harper. Amongst its 17 tracks are six unreleased and eight rare songs. All the tracks were recorded between 1964 and 1969. Tracks 1–9 date from 1964–1965 and were recorded on an old mono Ferrograph quarter-inch Reel-to-reel audio tape deck. These tracks formed a demo tape that landed Harper his first record contract. Track 10 is a re-recording of a part of that demo tape and became the B-side of Harper's first single. Tracks 11 and 13 became Harper's second single, while track 12 was