ᐅ Why does the color of my Billy bookcases change when exposed to sunlight?

Hello everyone, I have noticed for some time that the color of my Billy shelves changes when they are exposed to direct sunlight for extended periods. Specifically, the originally white painted surfaces appear increasingly yellowish over the months, especially in the window area. Can someone explain why this discoloration occurs with the Billy shelves? I suspect it has something to do with the effect of UV light on the paint or the material, but how exactly does this happen, and is there a way to minimize or prevent it? Thanks in advance for your input!

Discoloration often occurs due to UV radiation, which changes the material or the paint. Over time, the paint tends to become more brownish or yellowish from sunlight exposure. Usually, this can only be minimized by avoiding strong sunlight.

I can understand why you’d be surprised when a piece of furniture changes, as it can quickly affect the comfort of a room. I had a similar experience with my Billy bookcase, especially by windows facing south. The sun can be really harsh; I often wonder how long furniture can withstand it without damage. I believe this is a fundamental issue with painted surfaces, which simply aren’t fully UV-resistant.

Color changes in Billy shelving units caused by sunlight exposure are a well-known phenomenon and are mainly due to the photodegradation of the lacquer layer and the material used, typically an MDF board with a melamine resin coating. UV rays cause the polymers in the surface to chemically react, resulting in yellowish compounds. This is a normal aging process of plastics and coated surfaces. Additionally, the melamine resin used by IKEA can vary in UV sensitivity depending on the batch. There is no brand-specific version that is permanently UV-resistant. Avoiding or reducing discoloration is only possible through protective measures such as UV-filtering window films or placing the unit in less sunny areas.

One additional point: Heat from solar radiation can also accelerate chemical aging in the paint. This means that, besides UV light, increased surface temperatures can promote the yellowing process. Those who have shelves placed in areas with strong sunlight can counteract this with heat-absorbing measures or by temporarily darkening the windows.

This is brilliant, putting together some tips here! 🙂 I also find it fascinating how our furniture almost seems to come alive when you look at it this way – the color changes, and it responds to the surroundings! If you ever want to move a shelf, make sure it’s not exposed to direct sunlight. I did that myself, and the yellowed shelf now looks much less faded. Just give it a try!