Rubio makes a product that give wood floors that grey look. Check them out online.

We had a Vic Ash floor laid recently in our living room. The floor polishing person we used was excellent in every way, including helping us choose which products to use, which was a great start. He said that polyurethane gives timber that tan colouring, but water based (non-toxic) finish doesn't develop any colour - so you get the natural colour of the timber, intensified just a tiny bit as if it is wet - our finished floor is beautiful. If you want the timber tinted, they have tints they can apply before sealing. The water based non-toxic finish is more expensive, but more durable than polyurethane, and not high gloss which I dislike, so I decided readily that it is worth it. We are in Melbourne and the business name of this gentleman, Sasha, is S&A Flooring Services. They were very clean and methodical, leaving no mess or unsatisfactory areas of work. They did a beautiful job, and the finish was as he described in the first place when we chose the products. Getting people in for various advice, repairs or restorations in the home can be difficult and disappointing, so trades people like this man Sasha, and the resultant finish we live with, are a pleasure.

As long as you go darker they stain beautifully however the darker you go the more fluff and dust that shows. Get the sander to do a trial run first

Thank you. The finishes meet in the doorway in the picture as well as at the top of the stairs which is where the Lifeproof is installed.