Wood Floor Has Black Spots. When wood is exposed to water or metal for long, it causes dark spots on the wood. Very rapidly, what appeared to be black mold or mildew spread from the floor seams (gaps) and across the surface of the wood floor. I considered black iron oxide contamination, but such spots encapsulate once the finish is dry and do not spread.
Some were from staples that had rusted into little black circles, some were from other unknown things. Very rapidly, what appeared to be black mold or mildew spread from the floor seams (gaps) and across the surface of the wood floor. Poor cleaning and maintenance habits can also leave dark stains on your wood floor.
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Mineral streaks/deposits mineral streaks/deposits are a discolored line, spot, or band in the wood that may range in color from light gray to tan, olive green, brown, purple, blue, or black. How to remove black water stains from wood floors. Mineral streaks/deposits are naturally occurring, and they are often considered to add value and visual appeal to the wood. Dark stains on wood flooring are usually caused by urine or water spots that have remained untreated.