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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.

In many cases, it’s worth it to restore stone. Stone restoration generally costs less than replacing the stone entirely, helping to save on the cost of your project while still giving your home’s stone a polished appearance. However, if your stone is very cracked or crumbling to the point of compromising the structural integrity of your home, you may want to consider replacing it. Stone flooring costs range from $6 to $20 per square foot on average.