| http://www.w3.org/ns/prov#value | - Additionally, liquid hard surface discoloration removing compositions can be in the form of a liquid scouring composition including various other components such as alkali metal hydroxides for the control of pH, colorants, perfumes and abrasives such as silica, kaoline, calcite, dolomite, pumice stone, scoria, feldspar, ground marble and other ground rock as well as other abrasives well known in t
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