The answer to 'fence yellowing' is that it is a common issue caused by a variety of factors, including sun exposure, age, and environmental conditions. Fence yellowing typically occurs when the protective coatings on the wood start to break down, allowing the natural tannins in the wood to oxidize and turn yellow.
Some common symptoms of fence yellowing include a dull, faded appearance, a yellowish or brownish hue, and a rough or uneven texture. To address this problem, you can try cleaning and restoring the fence, applying a new stain or sealant, or in some cases, replacing the fence entirely. It's important to diagnose the root cause of the issue before taking action, as the solution may vary depending on the severity of the problem.