Macassar Ebony Can Sink in Water Dry Macassar Ebony averages approximately 1,120 kilograms per cubic meter—greater than the density of fresh water. A solid piece with little trapped air can therefore sink instead of float. Surprising takeaway: “Wood floats” is not a universal rule. Density varies among species and individual blanks, and exceptionally dense woods such as Macassar Ebony can behave more like stone in water.