Effect pigments based on Al.sub.2O.sub.3 flakes with high weather resistance and less photoactivity and to their use thereof in paints, industrial coatings, automotive coatings, printing inks, cosmetic formulations. The effect pigments have a ratio of the amount by weight of Al.sub.2O.sub.3 of the Al.sub.2O.sub.3 flake and the amount by weight of the metal oxide(s) of the coating layer(s) in the range of from 27:73 to 83:17 based on the total weight of the effect pigment.

An asymmetric pigment including a first Fabry-Perot structure; and a second Fabry-Perot structure; wherein the first Fabry-Perot structure and the second Fabry-Perot structure have a similar hue angle within +/45 degrees is disclosed. Other asymmetric pigments are also disclosed as well as methods of making the disclosed pigments.

A method of producing mixtures of interference pigments having special effects comprises mixing at least one large particle size interference pigment with at least one normal size interference pigment of predetermined colors and in proportions desired to obtain a unique effect.

Frits or frit mixtures with pearlescent pigments for materials, such as ceramic glazes, which are stable above 1000 C.

The present invention relates to a process for colouring surfaces, in particular surfaces of foods, with effect pigments, preferably pearlescent pigments, based on flake-form substrates, where (i) the effect pigment is incorporated into a pasty, transparent, water-based material and (ii) the application medium prepared in step (i) is applied to the surface.

A process for the preparation and colouring of pulverulent foods which is distinguished by the fact that uncoloured pulverulent foods are mixed with effect pigments based on flake-form substrates.

A gold pigment is disclosed. The gold pigment according to the present disclosure includes a substrate; a first coating layer formed on a surface of the substrate and including a metal oxide having a refractive index of more than 1.8; a second coating layer formed on the first coating layer and including an oxide containing manganese; a third coating layer formed on the second coating layer and including a colorless metal oxide having a refractive index of 1.8 or less; a fourth coating layer formed on the third coating layer and including a metal oxide having a refractive index of more than 1.8; and a fifth coating layer formed on the fourth coating layer and including Fe.sub.2O.sub.3.

The present invention relates to weather-resistant pearlescent pigment, comprising a coated or uncoated platelet-shaped substrate which is selected from the group consisting of synthetic mica platelets, glass platelets, SiO.sub.2 platelets, Al.sub.2O.sub.3 platelets, synthetic boehmite platelets, BiOCl platelets and mixtures thereof, a chromophoric coating with at least one highly refractive metal oxide, and a top layer, wherein the top layer comprises the following layer sequence:
a) a first layer made of tin oxide and/or tin hydroxide and/or hydrated tin oxide, b) a second cerium-containing layer which comprises cerium oxide and/or cerium hydroxide and/or hydrated cerium oxide, c) an organic-chemical coating applied to the cerium-containing layer which contains oligomeric silanes or consists of them, wherein the oligomeric silanes have one or more amino groups and the oligomeric silanes are chemically bonded with the cerium-containing layer. The invention further relates to a process for the production and use of these pearlescent pigments.

Frits or frit mixtures with pearlescent pigments for materials, such as ceramic glazes, which are stable above 1000 C.

The present invention relates to a golden interference pigment which is suitable, in particular, for printing processes, to a process for the preparation of a pigment of this type, and to the use thereof.