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Yes, limestone often turns yellow over time when improperly cared for. The stone contains natural iron deposits, which can oxidize when exposed to water, acids, or harsh chemicals, such as bleach. Without exposure to water or chemicals, limestone should not turn yellow. Always seal limestone countertops to protect them from moisture, and only use gentle cleansers designed for stone.

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.

It depends on the material. Sandstone, slate, and granite can be slippery in wet weather. Applying a sealant to the stone can often stop it from absorbing moisture and may reduce the likelihood of slipping. If you're concerned about losing footing, a safer option might be bluestone or concrete.

When cleaning your patio, you’ll need to ensure the chemicals you use aren’t harsh enough to destroy the seal or stones. You can clean the stones with a mixture of white vinegar and water or soapy water and a scrub brush. Just be sure not to use wire brushes, as these can scratch the surface.