About Chrome Ore. Chromium was first isolated as a metal in 1798, but it was not until 1818 that it was put to regular use in pigments for the manufacturing of wallpaper. With the development of the world .. GUARANTEED SPECIFICATIONS AT LOADING PORT: Chemical Composition (on Dry Basis) 48/46 Cr2O3 48% Basis, below 46% reject SiO2 6% MAX.