We recently refinished the hardwood floors at a house in north Portland and they were old growth fir flooring. The floors had previously been refinished using a waterborne finish and judging on the color and age they were probably done somewhere in the 5-10 year period beforehand.
The kitchen floor on the left was a little too worn through to refinish, so we left that portion in its original state. The floor on the right was after our process and was refinished using a Glitsa conversion varnish finish. Conversion varnishes are regarded as the true “Swedish” finishes and really enhance the warm caramel/amber color of a fir floor as you can see from the photo.
We hope that this photo does a good job of illustrating the color enhancement difference of hardwood floor finishes over time.