COMPOSITION SUITABLE FOR COLOURING CERAMIC MANUFACTURED ARTICLES AT THEIR SURFACE, PROCESS FOR COLOURING AND COLOURED ARTICLES OBTAINABLE THEREBY

摘要

Composition suitable for colouring ceramic manufactured articles at their surface and to a depth of at least 1 mm in shades from pink to purple to violet, said composition consisting of a solution in water or inmixture of water with a water soluble organic solvent of a monovalent gold thiolate that during the normal ceramic fire cycle releases corrosive vapours in quantity not higher than 2g502/g AU deposited, comprised in the formulas Au-5-R-X and Au-5-R-H where R stands for a linear or branched bivalent radical of aliphatic or aromatic or cycloaliphatic or heterocyclic type, optionally with substituents, such as for example aminic, amidic, hydroxylic, hydrocarbylic or carbonylic groups or CONH-, in the chain; X stands for a monovalent group selected out of -COOH, 5020H,-OH,-CONH2,-NH2;-0-P(0)(OH)2, in which H atoms may be replaced by alkyl groups and wherein acid groups may be salified with amines or alkaline or alkaline earth metals and basic groups may optionally be salified with organic acids.