Preheat oven to 200 degrees C. Line a 12 hole cupcake tray with patty cups.
Cream the sugar and butter until pale and fluffy.
Beat the eggs in one at a time adding a little flour in each time until the ingredients are mixed.
Add the vanilla essence and mix. Then add the milk 1 tablespoon at a time mixing after each addition.
Divide the mixture into 6 bowls:
In Bowl 1 - Add half a cap of red colouring
In Bowl 2 - Add half a cap of red and half a cap of yellow
In Bowl 3 - Add half a cap of yellow
In Bowl 4 - Add half a cap of green
In Bowl 5 - Add half a cap of blue
In Bowl 6 - Add half a cap of blue and half a cap of red
Mix colouring into each mixture after adding.
Divide the purple mixture between the 12 cases. Repeat with the other mixtures in this order: Blue, Green, Yellow, Orange, Red.