| abstract |
Inorganic spherical absorption pigments comprising silicon dioxide spheres having a diameter of 50 nm to 50 mm and a covering comprising a metal oxide with the exception of titanium dioxide or comprising a metal oxide and a material that confers color . The metal oxide is Fe2O3, FeO (OH), Fe3O4 or Cr2O3. The material that confers color is Prussian blue, carmin red, an organic pigment or an organic ink. |