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If you notice dull spots on your marble floor, that could result from etching. If you’ve used the wrong type of floor cleaner in the past or left a spill unattended for too long, your marble floor may have suffered some surface damage. While there are ways to protect your natural stone from etching, you may have to call in a professional for repairs.

Quartzite countertops are porous, meaning that liquids can seep into the stone and stain them. You’ll need to seal them before installing and resealing annually, depending on use and stone material. Sealing will help prevent stains and etching. On the other hand, you don’t need to seal quartz and other engineered stone countertops since they aren’t porous.

You generally cannot change the color of the natural stone, such as making granite countertops darker or lighter. Some people claim that certain chemicals will lighten or darken granite, but those will damage the stone and not provide uniform, expected results, so it’s better not to try. Similarly, some people ask whether they can stain over granite. Granite is beloved for its stain-resistant finish, so you probably won’t get the best outcome if you try to stain over granite to make it darker.

Instead, consider honing, painting, or applying another material over the top of the granite to make it appear darker.

Use pH-neutral cleaners, avoid acidic substances, and reseal porous stones periodically to maintain their finish.