Ron Birch is one of the best woods to show spalt figure on , because it is relatively plain . Lovely black line , sometimes green line , rarely pink line , sometimes mottled brown . Cut it , seal the ends very well , leave it on the ground , preferably out of the direct sun , for a year , evaluate it . If done to your liking , remove the bark , cut off checked ends , reseal , put it under cover . Slower the drying the better if you want unchecked pieces . Check for checked ends on a regular basis . If not done , leave for a few more months . Just remember that the process probably accelerates once begun . Also remember that birch bark is waterproof , hence the absolute need to remove the bark once spalted to your satisfaction . Small( 1-3 inch )dia braches may give you nice crotch figure , and will spalt and dry much faster than a 6-18 inch log . Wayne