Prepare cake batter according to instructions.

Place 1/3-1/2 of white batter into a well greased bundt pan.

Divide remaining batter into bowls according to number of colors needed.

Tint batter to colors wanted.

Make a “trough” in white batter with back of spoon and put colored batter into trough as well as possible. Don’t worry if it isn’t exact, it will move around while baking anyway. If you want a tunnel leave batter alone in the trough. If you want a swirled effect, take a knife and run it through the colored batter 3 or 4 times in a swirling motion.

Bake cake according to package directions, being careful not to overbake. Remove from oven when just done. Let cake cool completely, turn out of pan and frost or decorate when cooled completely.