Hi Steamer, ours is grey and white and the white sections never get stained, we have two kids and don't take any special care of the worktop, it wipes clean with water and always leaves a lovely shine, i don't understand what your supplier is saying because the worktop should be sealed, if this is done properly then it doesn't matter what falls on it, its the same when you buy porceline tiles, some need to be sealed and you pay extra because they are cheap to buy...i'd say your supplier is trying to pull a fast one in using cheap quartz that hasn't been sealed, you say that they came out and sand/sealed it, this would not be sufficient for a worktop, these need to be removed and factory sealed using proper industrial polishers...best of luck