Daffodil Cake

10 egg whites
1 teaspoon cream of tartar
1/2 teaspoon salt
1 1/4 cups white sugar
3/4 cup sifted cake flour
6 egg yolks
1/2 teaspoon orange extract
1/2 cup sifted cake flour
1 teaspoon vanilla extract

Directions
1 Preheat oven to 350 degrees F (175 degrees C). Wash the tube pan in hot soapy water to ensure it is totally grease-free.
2 In a large dry glass or metal bowl, whip egg whites until frothy. Add cream of tartar and salt, and continue to whip. When the whites can form soft peaks, gradually sprinkle in the sugar, while continuing to beat until stiff peaks form. Remove half of the whipped egg whites to a separate bowl.
3 Fold 3/4 cup of cake flour, orange extract, and egg yolks into one half of the egg whites until evenly blended. Fold the remaining 1/2 cup of cake flour into the other bowl of egg whites, along with the vanilla. Spoon about 1 cup of batter at a time, alternating colors, into the prepared pan.
4 Bake for 30 minutes in the preheated oven. Reduce heat to 325 degrees F (165 degrees C) and continue baking for another 20 minutes, or until the top of the cake springs back when pressed.
5 Without removing cake from pan, invert pan onto a wire rack to cool. Once completely cooled, remove cake from the pan and frost with your choice of frosting. Lemon Cream Cheese Frosting works quite well.