Cream softened butter and sugar. Add vanilla and rum extracts and a pinch of salt. Add eggs one at a time. Use electric mixer. Mixture should look pale yellow. Mix baking powder into flour and add alternately with milk to the mixture. Put 2/3 of the dough into a Bundt cake pan. Mix the 2 Tbl cocoa and 2 Tbl sugar with the 3 Tbl milk and add to the rest 1/3 of dough. Mix thoroughly. Add to the Bundt pan. Take a fork and swirl the dark dough into the light dough so that you get a marble effect. Bake at 350F for 50-65 min. Test with toothpick. You can also put it into a loaf pan. Freezes well. Kb.