Soak the fibre for at least 30 minutes in warm water. Add a squirt of washing up liquid.
While it's soaking, choose the colours of Kool-Aid you want to use. You can buy Kool-Aid here. And if you look here, you can see what colours you get from the different flavours. I chose pink grapefruit, cherry, grape and tropical punch. Mix the powders up with a little warm water. You can make the colours more or less intense by changing the amount of water you add. Mine was a bit trial and error!!
Lay out the wet 'sausage' of fibre on a table or worktop, on top of cling film. This cling film will wrap around the fibre once it's been dyed. The Kool-Aid will stain so wipe up any spills straight away!
Apply the dyes to the fibre. I used a separate syringe for each colour. Make sure that the dye penetrates right through the fibre so that there is no undyed fibre left. You might find it useful to wear some rubber gloves for this. Where two colours meet, blend them together.
Roll the cling film up around the fibre and place it in a microwaveable container. Make sure that the steam can escape from your container. I made some holes in the lid of mine. Microwave on medium power for about 5 minutes. Make sure that your yarn doesn't dry out.
When it's dyed, the residual liquid in the container should be pretty clear. If you need to, microwave for a further 5 minutes. Allow to cool and then rinse in warm water. If you use water that's too cold, you might end up felting your fibre! Hang up and allow to dry.
Coil up your braid so that you can admire it in all its beauty! It is now ready to be spun!