Wood bleach to get rid of deep dark stains?

Q imported from our old site, Face Lift Floors: I just bought an old home built in 1915 which has ‘vertical fir’ flooring under years of multiple coats of differing color paint as well as a glue which was used to adhere felt under a rug, I suppose. We removed most of the layers of glue and paint, but the floor seems to be deeply stained by the darker paints from years and years ago.

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What causes white spots on our floors?

Q imported from our old site, Face Lift Floors: I recently had the hardwood floors in my 1950’s house professionally refinished (sanded, stained, and polyurethaned). The floors were previously covered with carpet and had some stains, thought to be from carpet cleaning chemicals. A couple of months after the floors were refinished, white spots on some areas of the first floor started appearing and keep on getting worse. The floor is above a crawl space. The contractor said he thinks it’s from moisture; however, not all areas are affected and it seems the white spots are in the areas that were previously stained. (- from an Environmental Scientist)

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Dark round pigmented areas

Q: I have sanded my old pine floor boards and finished with water based lacquer. Around the floor nails I am noticing dark round pigmented areas. Is this normal with reclaimed floors or is it because I used water based lacquer? I think maybe this is oxidation from the nail?

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Rug outline on newly finished floor in short time

Q: I had my wood floors refinished 2 months ago. I waited 3 weeks to put furniture and rugs down on them. I was vacuuming last week and rolled back the rug to vac underneath and found that there is an outline of the rug on the refinished floor. I don’t have a skylight or large windows, and it’s only been a few weeks since the floors were done.

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Worn foot path won’t sand out

Q: I first did a spot sand on the worn foot tracks in a hallway of a pine floor and the sanding looked pretty good. Then it was decided to just sand the whole hallway for fear the spot sanding would not match the rest. After doing a full sanding and cleaning up the excess dust, I applied a natural stain to the floor. As the stain dried, you can still see where the worn foot tracks were prior to sanding.

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