Patent ID: 8388768

Claim:
A method for preparing an artificial patination material for a copper containing substrate said method comprising: using at least one copper salt as a raw material, precipitating said raw material with an alkali metal hydroxide to form a sludge; filtering a precipitate from the formed sludge; stopping the reaction between the raw material and the alkali metal hydroxide with water; dispersing the precipitate with powerful mixing and an addition of a dispersing agent; and in addition, using both an oxidative agent and carbon as an agent for catalysing natural patina forming and at least one stable metal compound as a colour pigment for achieving a desired colour and/or colour tinge, wherein a part of the patination material is posnjakite (Cu 4 SO 4 (OH) 6 *2H 2 O) with a grain size between 0.2-80 μm.