Blue Stain Pine, also known as Beetle Kill Pine, is distinguished by its bluish colored wood. This discoloration is caused by various dark-colored microscopic fungi that cause a bluish or grayish discoloration in the sapwood of the tree. The shades of this discoloration can range from dark blue to bluish black or gray to brown. This bluish coloring can add unique character to any woodworking project. Blue Stain Pine is used to produce millwork, sashes, panel doors, interior trim, cabinetry, furniture, match sticks and some plywood veneers. Lower grades are used in construction, roof boards, sheathing, and crating.