How do rust stains form on marble or limestone?

Brown stains on natural stone such as marble or limestone are often caused by rust. These stains occur when iron-containing objects like flowerpots, garden furniture or fertilizers come into contact with the stone. Moisture and oxygen cause the metal to oxidize. These metal oxides penetrate the porous surface, resulting in stubborn discoloration. Calcareous stones are particularly vulnerable because they can’t tolerate acidic cleaners. Regular cleaning agents are often ineffective and may damage the stone. That’s why a specialized rust remover is essential – one that’s both effective and gentle on sensitive surfaces. HMK R179 Rust Remover is a professional solution developed specifically for acid-sensitive natural stone.

HMK R179 Rust Remover effectively removes rust stains caused by metal objects or fertilizers.

HMK R179 Rust Remover is a ready-to-use product designed to remove rust and metal oxide stains from calcareous stones like marble, travertine or limestone. The acid-free formula doesn’t harm the surface, making it ideal for delicate materials. The product reacts with rust particles in the stone, temporarily turning purple – a visible sign of the active cleaning process. After 10 to 15 minutes, residues can be easily rinsed away with water and an acid-free base cleaner. HMK R179 is suitable for both indoor and outdoor use and helps prevent future stains thanks to its rust-inhibiting ingredients. It restores the natural appearance of the stone in a long-lasting way.