Natural Food Colouring
Natural Food Colouring
I found that by stewing a small quantity of covered blackcurrants in no extra water (just what was stuck on from washing and their own juice), and straining the liquid to use in making glace icing, a very attractive colour was produced. This varies depending on how much of the cooking juice to icing sugar is used but it's still a strong colour using amounts sufficient to cover a standard sized cake.