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 a single contender which didn't make the cut. Track 14 is the earliest recording on this album. Tracks 15 and 16 were both recorded in 1967. Track 15 became the A-side of Harper's third single, however track 16 was rejected. Track 17 goes back to 1965–1966 and is the A-side of Harper's first single. "All tracks credited to Roy Harper" 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