I've successfully used the white vinegar/steel wool version on Red Oak. Beautiful blue-black. Unfortunately, It's been spotty - I have had difficulty duplicating the result. Seems to vary from piece to piece. Thoughts?I’ve dissolved steel wool in white household vinegar, then painted the liquid on mahogany and it turns it black as ebony. I never knew about the heat treatment. I had a couple customers with mahogany runabouts and the deck sheer plank is almost always dyed black as a contrast. It is surprisingly lightfast.
Jim