In general, no. All stone, however, is porous to some extent, but granite has very little porosity. A few colors may absorb some moisture with prolonged contact compared to others. For example, a puddle of water left on the counter, for some colors, may show a dark spot when the water is wiped away. Usually, no evidence remains once the liquid is removed and the granite dries. A stone sealer is highly recommended for all granite after installation. Some stones are more porous than others, so it is important to use a penetrating sealer to prevent stains from oil, wine or other liquids from soaking into the surface.