Here’s a new one: an allergy warning about a camera. It seems that a chemical reaction can occur in the rubber handgrips of the Canon EOS 650D (the Rebel T4i) which turns the grips visibly white. That whiteness, it seems, is a chemical known as Zinc bis—which everybody knows can cause allergic reactions. (You knew that, right?) If you find that you have an affected model—which you can check via Canon’s web site—well, frankly, you should wash your hands after touching the camera. It seems this only affects a tiny batch of cameras made for just two weeks this spring, but if you find yourself in possession of an affected model—which you test by entering your serial number at the second link below—follow instructions on the site as Canon will be happy to remedy the situation.