Bog Oak.Morta.Knife blanks.Oak.Wood.Bog-wood.Bog.Black wood.Blanks.Black.Ancient.Raw Materials. 4800BP. For sale is a beautiful bog oak block that will be suitable for mod making, knife handles, pen blanks etc. Bog Oak is lifted by me from the bottom of rivers and lakes. Bog Wood has an age of 1000-6000 years. During this time wood changes color and density, becomes brown, gray or black. It is this piece of black wood that is perfect for making knife-handle. Oak is a very dense wood with a beautiful texture. So it is perfect for a cool knifes . The age of this piece of wood is 4800 years, which is confirmed by radio-carbon analysis.