Genuine mahogany’s specific gravity: .45 (green).
Specific gravity is the ratio of the density of a substance to the density of water.

Genuine mahogany’s radial shrinkage: 3.0 percent.
Radial or quartersawn boards have a grain running roughly perpendicular to the wide faces.

Genuine mahogany’s tangential shrinkage: 4.1 percent.
Tangential or flatsawn boards have grain running roughly parallel to the wide faces.

Example: A 12" wide flatsawn genuine mahogany board will shrink .103" (about 3/32") from 12 percent moisture content to 6 percent, and a quartersawn board will shrink .076" (about 1/16").