Hi steamer
Steamer I don't know where you live but a pine wood or spruce is very
likely, turpentine is made from yellow pine, Balsam Fir also has a lot
of resin in it, the bleu/grey color would be blue stain or fungus, very
prevalent in softwoods, just an educated guess.
http://homepage.mac.com/l.vanderloo/PhotoAlbum28.html
Have fun and take care
Leo Van Der Loo