Blue-Stain by Jana L | Feb 25, 2022 | Glossary of Terms, Glossary of Terms -B, Uncategorized | 0 comments Discoloration in the sapwood of pine. At one time, this was thought to be a serious defect but now it is used as high-quality interior finish. Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.