Preheat oven to 350°. In medium bowl, stir flour, cocoa, baking soda, and salt until well blended. In small bowl, combine buttermilk, food coloring and vanilla extract.
In large bowl, with mixer at medium speed, beat sugar, and butter 3 minutes or until light and fluffy. Add eggs, 1 at a time, scraping bowl occasionally with rubber spatula. Reduce speed to low. Alternately add flour mixture, and buttermilk mixture and be
Line muffin pans with 24 standard paper liners. Spoon batter evenly into cups. Bake 22 to 24 minutes or until toothpick inserted in center of cupcakes comes out clean, rotating pans between upper and lower racks halfway through baking. Cool cupcakes in pa