Abstract: Passivated metallic pigments obtainable by gas-phase decomposition of volatile phosphorus compounds and of volatile nitrogenous silicon compounds with steam and/or oxygen in the presence of the agitated pigment particles, and the production of these pigments and their use for coloring water-based printing inks, other inks and paints.

Abstract: A process for preparing transparent yellow iron oxide pigments by the precipitation of iron (II) hydroxide by adding an inorganic base to an iron (II) salt solution and subsequent oxidation to FeOOH.

Abstract: Luster pigments comprise coated plateletlike substrates wherein the coating comprises a layer comprising bismuth vanadate.

Abstract: Luster pigments based on coated, plateletlike, silicatic or metallic substrates wherein the coating comprises a metal sulfide are useful for coloring paints, printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations.

Abstract: There are described luster pigments based on metal oxide-coated aluminum platelets wherein the substrate aluminum platelets have a total carbon content <0.1% by weight, and the preparation and use of these pigments.

Abstract: Luster pigments useful for coloring paints, printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations are based on multiply coated plateletlike metallic substrates comprisingA) a first, colorless or selectively absorbing layer of metal oxide,B) a second, nonselectively absorbing layer of carbon, metal and/or metal oxide, andC) if desired a third, colorless or selectively absorbing layer of metal oxide.

Abstract: A simple process for achieving very active passivation of metal pigments against hydroxyl-containing compounds comprises treating the metal pigments with passivators in the gas phase.

Abstract: Mixtures useful as luster pigments for coloring paints, printing inks, plastics, decorative cosmetic preparations and ceramic products and usable in dry form in printing and coating processes consist ofA) iron oxide-coated aluminum particles andB) iron oxide-coated mica particles with or without a prior coating of a colorless, highly refractive metal oxide as essential components.

Abstract: An essentially monoclinic bismuth vanadate of the formula Bi[V.sub.1-x P.sub.x)O.sub.4 ] where x is from 0 to 0.1 has a chroma of .gtoreq.85, a lightness of .gtoreq.80, a hue angle of from 89 to 95 and a photochromism with a .DELTA.E value of .ltoreq.2 under the CIELAB system.

Abstract: Iron oxides in the form of platelets are produced by hydrothermal treatment of aqueous suspensions containing iron(III) hydroxide or oxide hydrates in the presence of alkali metal hydroxides and of aluminum and/or silicon compounds in two stages. The normality of the alkali is from 0 2 to 2 N in the first stage and is increased by from 0.2 to 2.5 in the second stage.The two-stage process according to the invention makes it possible to produce hematite pigments which are in the form of platelets, have increased luster, larger particle diameter, improved dispersibility and color hues which can be adjusted as desired.

Abstract: A luster pigment is described which is made up of a metal oxide film on a colored platelet-like support. The support is a pigment having a length of 3-150 .mu.m, a width of 3-150 .mu.m, and a thickness of 0.1-2 .mu.m. A process is described for the preparation of the pigment in which an organic platelet-like pigment is coated with a metal-oxide film by chemical vapor deposition. The preferred platelet-like organic pigment is .beta.-copper phthalocyanine.

Abstract: Metallically bright reflection pigments comprising a substrate of plateletlike aluminum and coatings of titanium oxides applied on top of the substrate are used for coloring paints, plastics, printing inks, ceramic articles, glasses and cosmetic products.

Abstract: Particularly bluish pearl luster pigments are produced by treating titanium dioxide coated mica pigments where the optical thickness of the titanium dioxide coating is from 50 to 100 nm or from 300 to 340 nm with ammonia at from 750 to 850.degree. C. with constant agitation.

Abstract: Plateletlike pigments based on iron oxide and having a spinel structure of the composition:Mn.sub.u Al.sub.v Fe.sub.[3-(u+v)]-z O.sub.4-z,whereu is from 0.01-0.09,v is from 0-0.3 andz is from 0-1.The pigments can be used for producing decorative coatings, in particular in paints, plastics, prints and cosmetics, for producing electromagnetic screens, as substrates for coatings and as pigments having magnetic properties.