Mica is a mineral material and it is made into powder. Mica is used for paper to make use of its glitter, which changes depending on the sight angles.
Rough mice powder is scattered over the surface of ryōshi like Kōyagire and Kojimagire.
For Karakami (printed paper), more minute mica powder is mixed with glue and glue plants and then the mixture is used as paints for printing on engraved woodblocks.