Had butter that was about to expire and some caster sugar left, so I made marble cake. I initially wanted to make the standard marble cake, as in the basic chocolate and vanilla flavour/colour but I figured I might as well add some colours to give it a psychedelic finish. The colours did not turn out as well I had expected it to be. It should have been brighter. Might be because I added only 1 tbps of colouring as opposed to the recommended 2 tbps.