So I am thinking this is a term invented somewhere in the chess manufacturing community and then just repeated by others. Sometimes these sites claim that Bud Rosewood and Red Sandalwood are the same.
Since I cannot find any reliable source for what Bud Rosewood is, is it possible that there is a connection between Bud Rosewood and RS?
The typical explanation, btw, for Bud Rosewood is that it is from the roots of the rosewood tree. It is usually a deep wine red with orange highlights. Actually a very nice wood for a chess piece.