The only reason an egg’s yolk would ever be a ‘bright’ orange is due to the feed, which colours the yolk. Any eggs coming from free range, naturally fed hens will generally be much lighter, and it’s these eggs I always look for. If I try a brand and find the yolks to be ‘bright’, it’s a sure sign that the farms feed was manipulated, calling into question any other practices related to the egg’s production, and I choose not to buy them again.