| abstract |
【Task】 Provided are metal colloid particles exhibiting an unprecedented design. [Solution] A composite metal colloid solution obtained by performing reduction of a second metal compound in a first metal colloid solution containing a polymer pigment dispersant, wherein the first metal colloid solution contains the polymer pigment dispersion. The first metal compound can be obtained by reducing the first metal compound in the presence of an agent, wherein the first metal and the second metal are selected from the group consisting of gold, silver and copper, and the first metal is When gold is used, the second metal is silver or copper, and when the first metal is silver, the second metal is preferably gold from the viewpoint of design. |