| http://www.w3.org/ns/prov#value | - of the gypsum that is additionally precipitated out inthe second stage, no residues of any kind any longer accumulate that have to be disposed of or reprocessed (see Example 6).The iron-oxide pigments obtained in accordance with the invention can be used for the dyeing of paints, lacquers, plastics, building materials, paper and other materials.
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