Stone coasters are a relatively new product. They’re made from naturally absorbent parts of sandstone. The sandstone is absorbent since its surface contains thousands of tiny, microscopic holes that allow moisture to collapse down under the surface of the material. Yet these holes are so small that the liquid cannot get all of the way through a bit of rock, and therefore it becomes trapped inside the belly of this material, waiting till it could escape by evaporating into the air.
Should you overuse a pair of stone coasters it’s likely that they can get saturated? This means that the rock is indeed saturated through water which it cannot absorb anymore. However that is very rare, unless you’re utilizing out your coasters in a rainstorm. When it will somehow occur, you may simply leave them out in a warm dry area for a couple hours and the liquid must vanish away by itself.
There are really a couple of different kinds of stone coasters which are available. The first sandstone coasters were only squares of stone, honed flat, and created in the sterile material. These were split into two kinds, the coasters created from southwestern American sandstone, and people created out of imported Asian sandstone.
Generally the imported sandstone was more absorbent, but that also made them more likely to spots. The imported materials were also more colorful and diverse. Meanwhile the national coasters were more powerful, and easier to print on, although initially printing ruined the absorbency of this rock.
Through the years a procedure was developed that enabled manufacturers to print right on the rock in this manner that it didn’t interfere with the absorbency of this material. This opened the world up to a completely new set of sandstone coasters, all in a huge array of colors, pictures, designs, and colors.