The brown color of the window core is often chosen in PVC windows that are intended to mimic the look of wood or other darker materials. This core color blends perfectly with decorative films in shades of brown, beige or wood, giving the windows a classic and elegant look. The brown core minimizes the visibility of any damage on dark windows, making them more aesthetically pleasing and visually durable. It is a popular choice in traditional and rustic architectural styles.