The patterns in spalted maple lumber are very unique: there is no other pattern like it in nature. Spalted maple can be either hard maple or soft maple – the spalt will occur in either species. The veins in the grain occur when fungus attacks the wood. Because the wood contains the fungus, it becomes much softer and must be handled delicately when worked.
Care must be taken when sanding or grinding spalted maple lumber – you can easily take away too much very quickly. Tools should be very sharp in order to avoid tear-out of the softer fibers.