Taking up and re-milling floorboards like that will incur 50% loss of the footage you are starting with, if your photo is a fair representation of the whole. If you run into powderpost beetle infestation, it will be more, maybe a total loss.

Just so you know before you start down that path.

You will need a metal detector to get all the hidden nails, pins and tacks out of it, which will spoil your cutters and blades.

The finishing questions are far in the future yet. If you want a washed greyish type of flooring, is it wisest to start with antique pine?

Casey

Thank you for the comment, @Sombreuil

We have roughly 1600sqft of the floorboards, almost all of which are in good shape (we can see the underside of the floor above since we're down to the studs.) The homeowners of yesteryear actually put down newspaper when they covered the subflooring with layers and layers of linoleum, so they were largely protected in many places. We are hiring a company to pull a denail them- we are not planning on doing this ourselves!

The flooring in the kitchen photo above is not really the target color- the cabinets, however, are the color we're hoping for in our kitchen. We are not really looking for a gray undertone, but certainly not a very yellow one. More so something with a bit more richness and a bit darker, which is why I was looking for suggestions from the fine folks here...

You either love the wood as is, or you do something else. You are not describing pine. You are describing something else. At half the cost of salvaging the existing. Sell the pine to someone who appreciates the nature of pine to fund the something else.