Preheat oven to 350F Line standard muffin pan with baking cups.

In Medium bowl, combine flour, cocoa, baking powder and salt; set aside. In large bowl, cream butter and sugar with electric mixer until light and fluffy. Add eggs, icing colour and vanilla extract; mix well until icing colour is well incorporated (scraping down the sides of the bowl when necessary). Alternately add flour mixture and buttermilk to butter mixture; add water and mix well. In a small bowl, combine white vinegar and baking soda; gently stir into cupcake mixture. Spoon into baking cups.
Bake 20-22 minutes or until a skewer inserted comes out clean. Cool cupcakes in pan on cooling rack; cool completely.
Makes about 20 standard cupcakes