I've got questions about the weathering damage on my Lego set for the white Saturn rocket. It's not the fact that sitting in sunlight for years has started discoloring it, I'm curious why the discoloration happened as it did. Instead of discoloring in bands matching where sun exposure most made it through slits in my blinds, some pieces are a discolored yellow while others are still plain white. Either a whole brick yellowed evenly at once or not at all and the ship is now a checkerboard of white and yellowed bricks. Why?
And, once discolored, is there any way to rewhiten? I'm guessing not, but might as well ask.
Thanks.