Fresh from an Early Modern Philosophy seminar, Hobbes, Galileo and co had got me thinking about colour. I was meant to be contemplating whether it's a primary or secondary quality of a substance, but actually thought: I wonder if I could make purple icing from pink and blue food colouring?

Um, no, it made a colour resembling camoflage cream. Great if I ever make an army cake....not great for decent looking buttercream icing. What if I add more pink....
Um, no. It makes chocolate brown. Without the chocolate.
That's what not to do. But I did learn how to make very tasty butter cream:
- Microwave a random but sensible quantity of actual butter NOT marge for 10 seconds, but no longer! In fact, I'd stop it at 8.
- Gradually mix in icing sugar in small amounts at a time, using the back of a fork. You'll know it's enough when the mixture suddenly changes appearance to a creamy beauty; taste testing recommended.
- Add a small splash of rum flavouring, trust me. But don't go crazy with it, great as it is.
- Add food colouring as desired, peach and blue look nice....