Marble Stain Test

This can be restored by your marble contractor.

Marble stain test.

And some granite may not be true granite but a mutt stone that maybe is mixed with calcite like marble and the surface will corrode or etch when exposed to acids like lemon juice coffee alcohol salad dressing. When testing with mineral oil know that mineral oil will evaporate and is not an indication that your marble or granite is damaged but rather that it needs marble sealing. These stains can be the result of a water glass that was left on a marble countertop for too long or from hard water buildup around sinks and showers. Water stains are yet another common stain that occurs on marble.

On the other hand if a stain is present where the mineral oil was you will need to seal marble and or granite with a petroleum based sealer. More persistent ink stains and larger paint stains can be removed with the help of a marble poultice that will soak up the pigments from the stain within a couple of days. For instance blue pearl granite absorbency is typically much lower than white granite so blue pearl is much harder to stain. Due to the oils and acidity in the olive oil the marble is actually etched meaning the sheen from the marble is pulled out of the stone.

Even after 10 minutes we can see the residual stain from the olive oil. The stain gets more pronounced as time goes on increasing in size and darkening in color.