You should buy at least eight white carnations and spread a layer of newspapers on your work surface. Fill eight plastic cups half full with lukewarm water and add 15 drops of food coloring to each cup. Cut the end of each carnation at an angle and put one cut in each cup. Remove them when they get your desired color and rinse them. To get more details, go to http://www.ehow.com/how_5820111_color-carnations-food-coloring.html.