For icing, in large bowl, beat shortening and 1/2 cup butter with electric mixer until light and fluffy. Beat in vanilla. Gradually add 4 cups sugar, one cup at a time, beating well on medium speed. Scrape sides and bottom of bowl often. When all sugar has been mixed in, icing will appear dry. Slowly add milk and Wilton Color Right Base Color; beat at medium speed until light and fluffy.
Use Color Right base colors and QuickCount color formulas to tint icing in the following shades:
- Summer Blue: 2 cups white icing + 40B
- Bold and Bright Yellow: 2 cups of white icing + 2O + 10Y.