It has been found that bismuth can be milled into pigment platelets. A metallic pigment comprises bismuth metal and an organic additive. The pigment is platelet shaped. In addition, the platelet shaped pigment comprising bismuth metal can be produced by physical vapor deposition (PVD) methods. In some embodiments, the metallic pigment comprises multiple layers.

A metallic effect pigment with an additive, the additive being applied on at least a portion of the metallic effect pigment. The additive comprises, as structural units, at least one carboxylic acid having at least 4 carbon atoms and also at least one polyglycol ether. The carboxylic acid and the polyglycol ether are bonded covalently to one another. The disclosure is also directed to a method for producing these metallic effect pigments, and to the use thereof, as well as to a printing ink comprising the pigments.

A method for manufacturing metal powder comprising: providing a basic metal salt solution; contacting the basic metal salt solution with a reducing agent to precipitate metal powder therefrom; and recovering precipitated metal powder from the solvent.

The disclosed method and related systems and devices relate to producing a pigment from microbial biomass. The pigment may be an engineered black pigment. The method may include a thermal processing step where the microbial biomass is charred. The biomass in the charred and pre-charred state can be washed chemically and/or mechanically. In another step the biomass is ground via a grinding of milling process. The grinding/milling may occur at any various points in the process. In some embodiments the biomass has a particle size between 0.01 and 100 microns.

The disclosed method and related systems and devices relate to producing a pigment from microbial biomass. The pigment may be an engineered black pigment. The method may include a thermal processing step where the microbial biomass is charred. The biomass in the charred and pre-charred state can be washed chemically and/or mechanically. In another step the biomass is ground via a grinding of milling process. The grinding/milling may occur at any various points in the process. In some embodiments the biomass has a particle size between 0.01 and 100 microns.