Add sugar to the butter and beat until light. Sift dry ingredients and add alternately with ice water and flavorings, beating thoroughly after each addition. Fold in the beaten egg whites. Separate equally into five bowls. Leave the first pan white, then add a touch of food coloring to each bowl, adding a bit more as you go along. Fold in the coloring carefully.
Pour into five 6-inch greased layer pans and bake at 350 degrees for about 30 minutes
Recipe by Just a Smidgen at https://justasmidgen.com/2012/01/24/pas-de-deux-blush-pink-ruffled-rainbow-layer-cake/