Natural stone is porous by nature and will stain. Because stone is porous you can sometimes remove the stain by reversing the staining process. If you re-absorb the stain into a medium, you can remove it from the stone. The typical medium is called a poultics. Stains should be treated as soon as possible. As times goes by it becomes increasingly difficult to remove the stain. Attempts to remove stains should not precede stain determination. Using the appropriate removal technique is important to achieve desired results. You must ask question to determine what the stain is.
Daily activities can cause stains on natural stone, badly affect the surface. There are many stains which are caused by different reasons:
Oil stains (i.e. any type of vegetable oil, certain mineral oils – motor oil, butter, margarine, melted animal fat, cosmetics, etc.) can leave a dark stain which can be difficult to remove. Organic stains (i.e. coffee, tea, fruit juices, tobacco, paper, food, urine, leaves, bark, bird droppings, etc.) can leave a yellow, pink to brown stains.
Metal stains (i.e. iron, rust, copper, bronze, etc.) have orange to brown colors and shape like what create them such as nails, latches, screws, flower vases, metal furniture...
Biological stains (i.e. algae, fungi, lichens, mosses, etc.) or ink stains (i.e. pen, ink, flares, etc.) or paint, fire, smoke stains can also damage the surface. Stains caused by the stone’s characteristic.
Cleaning stains, mold, grease ... especially the stain removal is always a challenge.