Latex exhibits osmotic properties. This simply means it does not allow water or other liquids through, but it absorbs a portion of it in the material. This is reversible, as it requires some time to dry up again. These deposits of water and the like can lead to discoloration or bright spots in the material which usually appear milky cloudy. Especially with transparent latex, it is good to observe that some spots in the wear or wash are milky coloring. Even black or colored latex may appear gray or pale. But as I said however, this is a temporary phenomenon. Nothing is visible after drying. Nevertheless, the drying may last for several hours or even a day.