And gray doesn't tone down red (gray actually turns red to PINK)...GREEN tones down red. A floor that dark won't matter what colour base you work with. It will look 'black' most of the time anyways. Any flooring professional worth his/her salt will offer MANY stain patches on your freshly sanded floors. They will then apply a single coat of finish. They will go home for the night. You will 'live' with the patches for a day or two and then pick the colour patch that you like THE MOST. The professional will then come back, sand off the patches and then start the staining process using the mix you like the most. Always, and I mean ALWAYS visit the site every evening during the refinishing process. You want to ensure the stain colour put down + 1 coat (over the entire floor) is REALLY what you want. If you feel the colour isn't working for you, it is BEST to figure that out after day 1...not day 3.

Your floors have a stain on them, don't they? The 'white spots' are improper penetration of the stain. The 'finish' is fine (the Bona on top) but the STAIN underneath the Bona has concerns. The stain has not been worked evenly. It can also be a sanding issue. Do you have 'in progress' photos? How long ago were the floors installed/finished? How many coats? Were you there to supervise the staining?

Hi! I am experiencing the same situation where my living room is equipped with red oak floors from 1950 when the house was built, and my kitchen is installed with new wood floors. One of the pain points is that it's hard to find stain that will blend two different floors together even though they're both red oak. Did you have the same problem?

I only see the mix in the first image. Are these two different rooms? Why not just replace with the dominant specie? In the case o fthe first image, remove the white oak and complete with red oak. You then do not need to worry about matching a stain.