Oxalic Acid Stain Removal
Lifting dark stains out of finished wood with an oxalic-acid cleanser paste instead of refinishing.
Technique: Walnut Scratch Repair
Moving furniture finds every unprotected corner of a wood floor. A scratch through the finish exposes raw, pale fibers that catch the light and read from across the room — and on a floor you love, the choice seems to be living with it or calling a refinisher over what took two seconds to inflict.
Before anything drastic, try a walnut.
The oil darkens the pale exposed fibers back toward the surrounding tone, and the fine nut particles help fill the groove. On light scratches the mark can disappear outright — and the creator's test case was worse than that: genuine gouges in a vintage worn-oak parquet, visibly rescued.
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