All hardwood floors will gradually discolor over time, as the stain and wood is susceptible to ultraviolet light and frequent use, but you can minimize these effects with some simple steps.
The chemical is harsh on fabric, which is why most lifeguard uniform swimsuits are made from specially manufactured materials that don't fade or discolor easily.
Stay away from white colored stones, since these can discolor easily, and watch out for very soft limestones, such as Lagos Azul, which can pit inside a shower.
Squash bugs are a serious problem in the Western Hemisphere and can be found from coast to coast in the U.S. They suck the vital juices from plants and can inject a toxin that causes otherwise healthy plants to wilt, discolor and die.
A downside to cast iron is the chemical reaction caused with acidic foods like wine, tomatoes, and citrus fruits and they may discolor during cooking.
The downside to tiles with decals is that the decal may eventually degrade - either discolor, bubble, crack or peel - due to cleaning, water and the heat of the kitchen.
Since tetracycline can permanently discolor new teeth that are still forming, it is usually not prescribed for children unless no viable alternative is available.
So if you ever think that your job is difficult, just tell yourself that you are lucky it doesn't discolor or irritate your body on a regular basis!
However, tetracycline is usually not prescribed for children until after all of their permanent teeth have erupted, as it can permanently discolor teeth that are still forming.
If you place one in an area that's exposed to high humidity, it will resist oxidation, and if it's located in a kitchen or smoking room, it won't discolor and can easily be cleaned with vinegar or a damp cloth.