Bake at 300 degrees F (150 degrees C) for 2 1/2 hours for the 10 inch pan, 2 1/4 hours for the 8 inch pan, and 1 1/2 hours for the 5 inch pan. Cakes are done when they shrink from the sides of the pans. Remove the 5 inch cake from the oven and let stand in pan for one hour before turning out. When the 8 inch cake is done turn off the oven and let it stand for 1/2 hour more in oven, remove it then 15 minutes later remove the 10 inch cake. Let the 8 and 10 inch cakes stand on cooling rack for 1/2 hour before turning out. Allow cakes to cool overnight before frosting. If the cake tiers are to be separated by pillars, the holes left by the tube pans may be covered by rounds of cardboard before they are iced. Use Decorator Frosting and decorate as desired.