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In a small container, combine equal parts oil and powdered pumice to form a thin paste. Apply a conservative amount of the abrasive paste to the affected area before buffing it thoroughly with extra-fine steel wool scrubbing pad. As you polish, the scratch will vanish before your very eyes. You can snag a bag of powdered pumice for just a few dollars from any major hardware store, as well as some beauty supply stores. The abrasive action of the steel wool and pumice together will gently wear away inconsistencies in the outermost part of the finish while the mineral oil nourishes and protects the wood. Pour 34 tablespoons (4459mL) of hot water into a mug, then add a bag of strong black tea or a scoop of instant coffee. Let the liquid steep for about 5 minutes, then soak up a small amount with a cotton swab and press it firmly into the scratch. When applied to bare wood, natural compounds in the coffee or tea known as tannins will essentially act as a natural stain, darkening the exposed wood by a few shades. Only black tea will produce the desired effectgreen, herbal, and other varieties of tea won't impart enough color to disguise most scratches. Saturate a cotton swab or small sponge brush with iodine and coax it into the heart of the scratch. Iodine dries to a dark brown color that's ideal for camouflaging imperfections in woods like cherry, mahogany, rosewood, walnut, and teak. Concentrate the iodine inside the scratch itself as best you can. It could stain if it ends up on a neighboring section of the piece. This one couldn't be easier. Just take a walnut, remove the shell, and work it back and forth over the scratch with about the same pressure you would use to erase a pencil mark. Walnuts are rich in earthy oils that can make a fine substitute for finishes of a similar color. You'll get the best results cracking your own raw walnuts, which typically contain higher concentrations of natural oils. If you don't happen to have any walnuts on hand, another type of oily nut, such as pecans or peanuts (or even peanut butter), may also do the trick.
Even out shallow surface scratches with mineral oil and pumice powder. Use coffee or tea to mask thin scratches. Hide scratches in dark wood surfaces with iodine. Rub a shelled walnut onto the scratch to magically erase it in seconds.