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Removing Dark Rings From Wood Furniture With Oxalic Acid

Various things -- including a cup filled with a cold beverage -- can cause dark rings to appear on wood furniture. These discolorations will last for the life of the wood furniture unless you remove them. Oxalic acid -- also known as wood bleach -- will remove the dark rings safely from the wood furniture. However, the bleach may cause the grain of the wood to rise. If this happens, sand the raised wood lightly with a fine piece of sandpaper and stain to match the surrounding wood.

Things You'll Need

  • Oxalic acid
  • Distilled water
  • Microwave-safe jar
  • Spoon
  • Microwave
  • Paintbrush
  • Borax
  • Cloths
  • Soft towel
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Instructions

    • 1

      Pour 1 pint of hot water into a jar safe for microwave use. Add 2 to 4 teaspoons of oxalic acid crystals to the water and stir with a spoon. You must keep the oxalic acid mixture warm at all times during the following process. Reheat the mixture in a microwave oven if necessary, heating on "high" at 30-second intervals.

    • 2

      Dip the bristles of a clean paintbrush in the warm mixture and brush the mixture directly on the dark rings. Let the oxalic acid mixture dry on the rings.

    • 3

      Repeat the previous two steps until the dark rings are no longer visible.

    • 4

      Dissolve 2 tablespoons of borax in 1 pint of lukewarm water. Mix the powder and water with a spoon. Wipe the wood furniture with a cloth dampened in the mixture. The borax will neutralize the oxalic acid and stop the bleaching process.

    • 5

      Wipe the borax residue off the wood furniture with a damp cloth and dry with a soft towel.

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