Natural stone is a lifestyle choice. All natural stone is more or less porous, and will need to be sealed and maintained. This process causes the small invisible voids to be filled, and thus any liquids cannot penetrate the surface. This way any spillages can be cleaned off the surface of the tile. Natural stone is always packed wet, and will not dry until unpacked. At this time the colour will lighten. It is essential that the product is completely dry before fixing. All natural tiles vary, and can exhibit natural and geological variations, in terms of colour, marking and texture, and even with the most stringent manufacturing process, there will always be a variation in size and thickness. Because of this, samples are merely treated as guidelines to your finished application, and you will not necessarily receive the exact replica of what you have seen in the shop. Fixing stone floors is often better left to experienced fitters, who will grade your tiles to maximise the use of the shading and flaws that are inherent in this style of tile.