Black slate with a honed finish has a dark blue gray shade when the surface is dry, it becomes black when wet. We can visually see the grain of the stone, giving it a unique aspect. We can accentuate this dark black appearance with the apparent grain by applying a color enhancing sealer. This type of slate is of a higher quality to the level of hardness, wear and resistance to cracking. A floor of this slate will last decades. If you want a perfectly flat surface it is suggested to use the honed finish.