After laying the tile I noticed that they have a hazy patch which appears unglazed in each tile. Is there a substance that I could apply to give the tiles an even look?
Glazed porcelain or a true porcelain? If it is a glazed porcelain ( my guess) and you have spots that are un glazed, this is a manufacture defect and the tile (s) will have to be replaced. If this is just a grout haze there are cleaning methods you can do to get the grout ff. But other than that, there is nothing you can do other than replace tiles. If you bought the tiles at a regular flooring store, the manager or sales rep from that tile maker should be sent out to inspect it. With out knowing more its hard to say what else you can do. Any questions you cn e mail me through my avatar and check my qualifications there. GL
Did you glaze them yourself? If not call the manufacturer....they should send a rep to your home or send a sample of tiles to determine what to do.