...certainly ebonizing using India ink has been suggested here before. FWIW I tried the steel wool in vinegar, black leather dye and India ink on some white oak. India ink is vastly superior to the other two. When you go to the ink shelf in the store there several brands and types of India inks to choose from. Some are waterproof and some are water resistant and others have shellac. I got the largest size(2 oz.) they had in the Speedball brand Super Black India Ink. India ink is a pigment and will cover the wood grain completely but if you buff it a little some of the grain will show through depending on your diligence. YMMV
Larry