yellowing

Hi, All of our skirtings and windowsill are painted with Dulux High Gloss All of the areas covered by photos, ornaments etc have gone yellow. 1. Will the colour return to normal? 2. Are there any products that don’t turn yellow?

So I'm decorating my living room, have put up a picture rail and painted the first coat above the picture rail with some Wickes Pink to White paint I had leftover from painting my bedroom ceiling. The first coat looked fine but I needed to do a second coat but had run out that paint, so I went...