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I am having a problem with a black dye formula. I am following a G.Frank formula of logwood extract, then ferrous sulfate to produce the black; the color is fine but several things happen, when I try to steelwool the surface, the corners reappear as the natural color of the oak. The second problem, and more distressing, is that several weeks after the piece has been finished and waxed, a white “powder” or “chalking” is forming on the surface of the oak; similar to the white leaching one sees on brick wall. Any suggestions on how to prevent and or remove would be greatly appreciated, and or modifications to my black dye. Thank you in advance. Erick