Here's the situation: You spend months and months deciding on what flooring you want. You've finally chosen a beautiful Bellawood Brazilian Cherry. After having it installed and replacing your furniture, you love your new room. Fast forward six months. You decide it is time to do some redecorating so you rearrange the furniture. When you move your area rug you see that the color underneath is much lighter than where the rug wasn't. Does this mean that there was something wrong with your wood? Did the rug have something that effected your floor? How could this have happened?
There is actually a very simple explanation to all of this. It is called "patina" which can happen as your floor ages. This process can be rapid during the first three months, less in six months, and finishing in about one year. Moving furniture and rugs around helps to even out areas where light is not exposed to. Try to avoid large area rugs for the first three months if you can.
All wood species can change color over time due to oxidation or when exposed to light. In some species, the change can be more dramatic and may darken in color over time, while others tend to lighten. Currently, there is no known value set for Patina, or color change, of a species so contractors and or customers should be aware of this normal condition. The patina process is unrelated to the urethane finishes.
Some hardwoods that are known to make a dramatic difference are typically the exotic species, most notably Brazilian Cherry. Others that may change include Brazilian Koa, Purpleheart, and several others. Before you purchase a floor, ask if it patinas and if it gets lighter or darker. If you like the color of the flooring when it is first laid down and don't want any change, they may be able to guide you in the direction of a product that has a less likelihood to change color or a product that has a less dramatic change.
You can click on the link below to download a picture (and explanation) of the patina that may be experienced by putting an area rug over new hardwood floors.