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Like most stones, limestone should be sealed. Its porous nature makes it prone to staining from spills, and the iron in the stone can cause it to turn yellow when exposed to moisture or harsh chemicals. Proper sealing can help prevent these problems and protect the stone's appearance.

Bluestone patios can last anywhere from 50 to 100 years. Exactly how long your patio lasts depends on factors like how well the pavers or slabs were installed, soil conditions, and maintenance. Remember to reseal your patio every three to five years and stay on top of cleaning and replacing broken pavers. 

No, you cannot use vinegar to polish marble. It is too acidic for cleaning or polishing and can etch the surface. Instead, opt for non-acidic cleaners made specifically for marble. Follow the manufacturer’s directions to ensure proper application and to protect the marble. However, a damp mop can be an effective marble cleaner when used appropriately and as long as moisture is immediately soaked up.

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.