DON'T DO IT I had these marble tiles I LOVEd as backsplash. I sealed them all the time. It didn't matter. The heat from the range damaged the ones around the stove and the water damaged the ones behind the sink no matter what I did. I hate marble backsplash and marble countertops with heat of a ten thousand suns :) Here is a photo. Look behind the stove top ( I sold this house in March and got quartz for countertops and backsplash in the new one).

I assume you had the opportunity to view the backsplash before you bought it, so if it wasn't the material that you wanted -- regardless of what was advertised -- you didn't have to buy it. But you did buy it and have used it happily for two years, so it seems that it's satisfactory. I don't believe you have any claim. · If you do want to pursue this, you are going to have to be able to prove: (1) that the backsplash you bought two years ago is the same one that you found advertised now; (2) that the backsplash you bought was, in fact, advertised wrong when you bought it (you will need proof of the ads from 2 years ago); (3) that the change in advertising was done deliberately to cover up an error (you will need to hire an expert witness for this); (4) that the value of a marble backsplash is significantly greater than the value of a dolomite backsplash (you will need to hire another expert witness for this one); (5) and that you wouldn't have bought the backsplash that you did if you hadn't been misled. Unless you're talking about a value difference of $10,000 or more, it's probably not worth doing. · You can always try just complaining to the store's corporate customer service office and see if they might refund some portion of your money. But to impress them, you're going to need at least some proof as outlined above.