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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.

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.

Use pH-neutral cleaners specifically designed for stone surfaces to clean granite or marble. Avoid acidic or abrasive cleaners that can damage the sealant or the stone itself. Regular re-sealing helps protect the surface from stains and damage.

Unfortunately, the product Bar Keepers Friend won’t remove etching from stone countertops. In fact, it can make it worse. Bar Keepers Friend contains oxalic acid, which can cause further damage to natural stones like marble or limestone.