Abstract
Black powder, such as magnetite or metallic iron powder, absorbs incident visible light. But metallic silver-coated black powder reflects incident visible fight. The silver-coated powder was obtained by using electroless plating.
The silver layer on the black powder was composed of silver particles and the size of the silver particle was ranged from 5 nm to 80 nm.
When the amount of the metalized silver was small, silver perticles deposited like islands on the black powder. On the other hand, the large amount of silver particles deposited on the powder lead to formation of silver layer.
The color of the most bright silver-coated powder is pale yellow.
When the silver layer becomes thicker than the thickness in which the coated layer is opaque for incident visible light, the the brightness of the powder becomes almost same the constant value, and the color and the brightness of the powder were close to those of the silver powder.
