Had new granite worktops fitted last year a light sand / biscuit colour at a cost of £4.5k, after six months the colour suddenly began to darken. Any areas usually covered (such as under the toaster) remain similar to the original colour, everywhere else, the granite is staining and darkening, its even darkening on the edge of the island where I usually rest my arms while typing on the laptop. The company that supplied and fitted the worktops are remaining tight lipped as to what the problem actually is and a few weeks ago sent a guy here who washed it over with a peroxide cleaner, then resealed it with something called Hydrex. He wasn't here long and the treatment didn't appear to be that effective, just washing this stuff over the surface with some old rags. He told me to see how that turned out, needless to say, other than more of a sheen it hasn't cured the problem. I have been back in touch with the supplier, their answer is to send the chap back out next week to try again. Since the worktops were installed they have been carefully looked after, no harsh chemicals, my wife usually uses disposable wipes that say suitable for granite, any spills are cleaned up immediately. One thing though, reading up on the subject after the fact, apparently if granite is sealed properly water should bead on the surface, well, it always sank in from day one. I think they didn't seal the stone properly (is it even granite? as someone said to me) and I have actually said this to them about the sealant which they have neither denied or confirmed. What should I do to get this sorted out? greatfull if you can offer advice on the matter.