This is a great possibility if you would like to add some color to your hardwood floors. It is recommended to use an oil based stain, although there are water stains available. The stain must be evenly applied and then removed in order to penetrate the hardwood floor. There is a variety of standard stains available by Minwax who is the leading brand in the industry. A new technological development allows custom stain mixing making it possible to stain the floor in any color you desire. Staining requires expertise and will take longer, and therefore will cost more than a regular natural finishing process.