Information:

Mahogany is a medium-textured wood with straight & even or interlocked grain.
The heartwood is reddish-brown to deep red and is often exaggerated with stains or dyes.
The crotch is produced when the trunk divides into two branches and is generally displayed upside-down, as in Figure 1.

Its lustre and rich colour have kept it in demand for use on architectural elements and furnishings for many centuries.
Although it is often used as a solid wood, mahogany is usually associated with the dramatic designs of veneered furniture.

The painted imitation of timber; 'graining' or 'woodgraining' is taught at various places throughout the world.
See:   http://www.painting-effects.co.uk/workshops.htm