Abstract: A process for coloring an unglazed ceramic with an aqueous colorant solution containing a chromium (III) coordination compound which is at least partially neutralized and stable, including (a) dissolving a carboxylic acid selected from the group consisting of acetic acid, an organic dicarboxylic acid having a general formula (COOH)—(CH2)n—(COOH), where n ranges from 0 to 10, and an unsaturated, organic dicarboxylic acid in water at a temperature ranging from 40 to 60° C. to provide an aqueous solution of a carboxylic acid; (b) adding a chromium (III) compound to the aqueous solution of a carboxylic acid while stirring for a time and at a temperature effective for reaction to form an aqueous solution containing a chromium (III) coordination compound; (c) filtering the aqueous solution containing the chromium (III) coordination compound to provide a filtered aqueous solution; and (d) adjusting pH of the filtered aqueous solution to a pH ranging from 3 to 6.

Abstract: An aliphatic polyester amide which is hydrolysis-resistant includes a ternary polycondensation product of monomeric constituents composed of a monomeric constituent A which is at least one diol having a general formula: HO—R1—OH, where R1 is an aliphatic residue having 2-16 carbon atoms; a monomeric constituent B which is at least one dicarboxylic acid having a general formula: HOOC—R2—COOH, where R2 is an aliphatic residue having 1-14 carbon atoms; and a monomeric constituent C which is at least one diamine having a general formula: H2N—R3—NH2, where R3 is an aliphatic residue having 2-16 carbon atoms and is present in an amount of up to about 5% by weight based on total weight of the monomeric constituents, wherein polycondensation proceeds in the presence of a catalyst comprised of constituent D, which is a metal-containing catalyst, in combination with constituent E, which is at least one of an organic phosphorus compound and an inorganic phosphorus compound, and wherei

Abstract: A method for coloring a surface of a ceramic mass to produce a colored ceramic body includes providing a host lattice material composed of a colorless metal oxide compound which crystallizes into one of a spinel lattice or a rutile lattice and which may be water soluble; providing an aqueous coloring solution containing water; a first water soluble compound including a metal ion which is one of a two-valent metal ion or a three-valent metal ion and which colors the host lattice material; and a second water soluble compound including a metal ion which is one of a five-valent metal ion or six-valent metal ion and which provides electrostatic balance; generating a mixed-phase pigment in the surface of the ceramic mass by one of (i.) working a fine powder of the colorless metal oxide into the ceramic mass and applying the aqueous coloring solution onto at least one surface of the ceramic mass, or (i.i.

Abstract: The present invention relates to a method for coloring ceramic surfaces, wherein the surfaces are treated with an aqueous solution of alkali metal or ammonium dithiosulphatoaurate(I) with a gold concentration of 0.1-10% by weight, the water is evaporated and the dithiosulphatoaurate(I) is decomposed at temperatures of 300-1400.degree. C.