Maple is prone to a particular type of blue stain that is caused by mold during the drying process. A strong, 35-percent peroxide solution, like the UB" portion of wood bleach, can usually remove the stain.
Concentrated peroxide is very caustic, so wear goggles, gloves, and a waterproof apron.
You can buy 35-percent peroxide solution from a chemical supply company, or borrow it from your box of two-part wood bleach. Flood it onto the maple with a foam brush and let it dry com-
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