Beat sugar, vanilla and margarine till lighter

Add in an egg at a time as you beat.

Sieve flour and baking powder and mix. Add in flour into wet mixture followed by milk as you beat. Mix together into a smooth batter.

Separate batter into three parts. First add black food colour second purple food colour then remainder remains as is.

In a lined tin pour the batter in layers start with the colourless batter, followed by black, then colourless, purple, then colourless.

Bake for 40 minutes in a preheated oven at 180 degrees.