Hi, my husband has just started tiling a floor. White ceramic tiles which had been left outside for a couple of weeks. The tiles were not packaged watertight and some rain has got into them. I suspect they should have been left to dry out before tiling, however he's started the job as friend was in a rush to get it done. The white tiles are showing darker patches around edges. My question is will they dry out and patches disappear? Husband was a tiler to trade when younger but now only does the odd job for friends. Thanks.