A bluish or grayish discoloration of the sapwood caused by the growth of certain mold like fungi on the surface and in the interior of a piece, made possible by the same conditions that favor the growth of other fungi.
A bluish or grayish discoloration of the sapwood caused by the growth of certain mold like fungi on the surface and in the interior of a piece, made possible by the same conditions that favor the growth of other fungi.