Unfortunately, everything changes color under the influence of UV radiation. Also your Bubalou. The fabric used for your Bubalou has a light fastness of 7 on the scale of 8. Despite this, the color of your Bubalou will still change under the influence of UV radiation. If you use a tray for a long period of time on your pouf or leave cushions or plaids on the sofa, then color differences will occur in those places, because no UV radiation gets underneath. "Once a tray (or loose cushions, plaids etc), always a tray" is the motto here. Fortunately, it does not detract from seating comfort.