If you have any vintage folders with ebony handles the ebony is pure black and the grain is so tight that you need a loupe to just make out that there is a grain present. This wood came from old growth trees that grew slowly because of being crowded and partially shaded by other trees. You still find this kind of ebony on recently made knives if the maker has or had a source for pieces of ebony harvested many years ago. Old guitar manufacturing businesses can be a source for this.
Currently harvested ebony comes from tree farms, grown in the open, no shading and lots of water. Hence it grows rapidly and therefore is less dense, less black, and the grain is easily seen.
It is tree farming that gives this lower quality ebony, not the species of ebony or location it grows in.
kj