I'll second that - Pine has a habit of going orange if merely varnished and the trick to achieve that look is to paint with a thinned white base prior to the final protective finish.
If you search my
thread you'll see how I used a similar technique way more subtle than that which you want but you'll get the idea.
Personally I'd use a white primer thinned to suit and from the same manufacturer as your proposed protective finish coat so as to ensure bonding/paint compatibility and try on a few test pieces to thin it to get the effect you desire. You could try on a patch of the target floor and just sand it back if you get it wrong - it's pretty thin !
One thing to be careful about is that if thinning a lot (as I was) you run the risk of the white pigment pooling in the sanded grain of the timber - which maybe is not what you want.
If you speak/read Scandi then search some of their forums since it's been a popular look out there for 50+ years !!
/Ed