| abstract |
Platelet-shaped pigments of the formula Al x Fe 2-x O 3 , in which x has a value from 0.02 to 0.5.n n n The pigments are prepared by hydrothermal treatment of iron (III) hydroxide or oxide hydrate in aqueous suspension in the presence of alkali carbonate and / or hydroxide and dissolved alkali aluminate at temperatures above 170 ° C. They can be used to color coatings, glasses and plastics. |