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No refinisher should be without it.
You know the old black rings that are found on a lot of antique furniture that were made from metal cans sitting on the surface? These rings occur when steel or iron gets wet and comes in contact with a wood that contains tanic acid such as oak. The tanic acid in the wood and the metal form a black dye which seem almost impossible to remove.
To remove these rings, make a thick paste with oxylic acid and water. Then paint this paste thickly on the rings. Place a damp cloth on top and use a clothes iron with moderate heat on top of the cloth. Check from time to time and make sure you are not burning the wood with the clothes iron. This will work about 80% of the time.
 
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