Strange Materials of Pigments

The beauty of pigments is one of the appeal of Japanese painting.
Do you know the materials of pigments? There are some strange materials.

*Gunjo
A blue pigment made from azurite, a mineral which is found in copper ore deposits. It is expensive because it is produced in small quantities.

*Lapis lazuli
A blue pigment made from lazurite. It is often called Ultramarine.

*Rokusho
A green pigment made from malachite. It was used for mural paintings in the stone caves in China from around the 8th century.

*Shu
A red pigment. It is prepared from the reaction of mercury with sulfur.

*Gohun
A white pigment made from powdered oyster shells. It is also used for softening other colors by blending.