how to make a box white cake mix turn out white?!
use pillsbury cake mix.....they use egg whites only in the directions and the cake turns out perfectly white!!
If the recipe calls for butter, use a pure unsalted butter of excellent quality (margarine and some butter blends have added food coloring which will taint your cake.) If the recipe calls for oil instead, use a very light oil such as canola...again, some yellower/darker oils will color the batter. In addition, over baking the cake will cause it to be slightly yellow (and dry!) Good luck
If your making a white cake, it should turn out white if your following the directions, it might be "golden" on top, but that's as far as the yellow should be, I would just make sure it is a "white" cake mix, not yellow
Only use egg whites, seperate the eggs. u can use the olks for omelet or something later.