Hierarchy classification:

1. top of the aat hierarchies
2. Physical Attributes Facet
3. Color (hierarchy name)
4. [color and color-related phenomena]
5. color systems

Anotations

Scope note:

Additive color system devised by chemist Wilhelm Ostwald; based on 24 foundation colors arranged in a disc; each then have white and black added to form tints or shades; used predominantly in the mid-twentieth century.