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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 can’t change the color of the stone, but you can update granite countertops without replacing them by painting them. Because granite is a porous material, you’ll want to seal them first before painting them so that the paint doesn’t hurt the surface. This is important because you don’t want to devalue your counters by damaging the original surface; even if you don’t like the color now, you or a new homeowner may want to remove the paint someday and return them to their original color. You can also cover them with 

You can cut food on tough, scratch-resistant granite countertops. However, these hard surfaces can quickly dull your knife blades, and continual cutting in the same spot can eventually lead to marks forming and compromising the protective sealant. As with any countertop material, it’s always best to use a chopping board.

The frequency for sealing granite countertops depends on several factors, including the type of sealant used, the color of the granite, and how heavily the countertops are used. As a general guideline, resealing is often recommended every 12 to 18 months, but some sources suggest it could be as often as every few months or at least once a year.

The type of sealant is a major factor: water-based sealants may need reapplication every six months to a year, while more durable solvent-based sealants can last for five to 10 years. Additionally, factors like heavy kitchen traffic, frequent use of acidic cleaners, and lighter granite colors may require more frequent sealing to prevent staining.

To determine if your countertops need resealing, you can perform a simple water test. Place a few drops of water or a wet paper towel on an inconspicuous area of the granite. After 10 to 15 minutes, check the spot. If the water has beaded up, the seal is still intact. If the water has been absorbed and darkened the stone, it's time to apply a new coat of sealant. You can choose to seal the granite yourself or hire a professional to ensure it's done correctly.