My tiler informed me yesterday that the pen he uses to mark tiles before cutting them won't come off the tiles. He reckons he's tried everything and it won't come off. I don't know what sort of pen it is but it's some sort of thin blue marker pen. Whats weird is that the tiles are high quality Italian polished porcelain so I don't think the tiles have 'absorbed' the pen....
Anyone got any tips for removal.....
Thanks
Tony