*I would advise using Wilton/Sugarflair or equivalent brand concentrated gel paste food colour, not the gels from the supermarket or traditional liquid colouring. You will need a lot more food colouring and they are much runnier. This may affect the consistency of the fudge. I used Wilton Leaf Green for this fudge. I needed about 1/3 of a pea sized amount. Add very slowly and carefully as you can go from mild colour to WOAH in about 2 drops!!