Well with food colouring it isn't.
Off I went to Asda and came out with 5 colours and some white vinegar ( because you tube said so). Got home wool and colours at the ready.
I decided just to start with red and green, how lovely and bright they looked in the bowls, on my white sink in my white kitchen. I was a bit scared....
I followed the you tube video (do they still call them videos) to the letter!
But something went wrong. What? I don't know?