A mount of oyster shells, gofun.

Ostrea denselamellosa (Densely lamellated oyster) is a species of oyster whose shells are used to create gofun. The shells are first given 10 to 15 years of natural drying against the elements, a process that breaks down organic substances contained in the shells and allows foreign objects such as stone or fish scales attached to the shells to be easily removed. Gofun made from oyster shells is an excellent pigment that is resistant to flaking and soft enough to be easily applied with a brush and guarantees long-lasting whiteness.