hi vivaro,its called premier pink,some sections in the frame are beige/pink or sometimes all the frame is pink,this was due to a pvc mix mis sold to the window companies,to cure this the only way is to either spray paint them white again(which i beleive premier did and nearly bust them)or simply re-new,no amount of scrubbing will cure this,intresting though that the frames in constant sunlight stay white because the sun will bleach them,sad but intresting?if you took a window frame from the uk or europe to say the bahamas it would turn slightly blue in colour(its down to where you live in regards to the equator)thats where premier cocked up buying a cheap pvc mix which shouldn't have been used for europe -different strenghts of sunlight