Natural mineral pigments (天然岩絵具, Tennen Iwa-enogu) are made by grinding mineral ores (azurite, malachite, cinnabar, etc.) and other naturally derived materials into granular form. The raw materials are ground and divided into 10 particle sizes, each of which is assigned a number, from 5 (coarse) to 13 ( fine), with "Byaku(白, means white)"
