Green color coming to the surface

Q: Our white oak wood floors have a green color coming to the surface. It is getting our carpets stained too, from the foot traffic from the wood floor to the carpet. How can we repair our wood floor?

A: It sounds like tannin, but how or why it would be able to bleed through a polyurethane floor finish I don’t know. If this is restricted to several boards you may want to have those changed.