I can find a lot of information about how to prevent extra absorption of color in end grain. My problem is a little different. I'm refinishing an antique mahogany settee. I've sanded and sanded a curved area but still the end grain shows color on the inner curve - parallel blackish bands, one at the top and one at the bottom of the curve. I'm concerned about applying new stain because I assume the bands will show through, and appear darker than the rest of the piece. I don't suppose I can apply some knd of bleach to the end grain portion of the curve, can I? Any recommendations would be welcome.