I use Accraglass with the black dye added to hide any of the glue joint. Looks very good to me when done this way. That is if your ebony is really black. If not, just play a little with the dyes to get a good color match. It takes so very little dye to change the color of the raw Accraglass. Just dipping the end of a tooth pick in the dye is usually more than enough, for the little amount you are mixing up to glue this in.