HardikRaj Transparent TPU contains a small amount of blue coloring, making it appear clear. As it breaks down, the yellow color becomes visible and the blue fades.
TPU is naturally slightly yellow, so manufacturers add blue dye to counteract it. However, yellowing is inevitable due to aging and chemical reactions caused by heat, sunlight, and certain chemicals. UV light breaks down TPU, causing yellowing in clear phone cases. It’s not dirt or oil build-up, but degradation of the case itself. Depending on your location, you can get more UV light exposure, which accelerates this process.
