I recently installed prefinished hardwood floors about six months ago. We placed a non rubber backed rug underneath the kitchen table to minimize scratches in the floor. We are now selling the house and can see a distinct line where the rug was. This area is subject to sun in the morning. I have removed the rug. Do you think the rug covered area will catch up with the color of the rest of the flooring and how long should it take? Also, is this typical to occur after only six months? Thanks in advance for the help.