Does granite stain? In general, no. All stone is porous to some extent, however granite stain has very little porosity relative to other stones. Most granite colors will never show moisture but some colors will show a dark spot if a puddle of liquid is left on the counter for a period of 30 minutes of more. The spot will eventually dry up and evidence will show. To be safe, be sure that your granite is sealed properly – either by the fabricator, or after the granite is installed.