coloured milk experiment

on Tuesday my table and i did an experiment called marbled milk.Each table had a bowl of milk 3 different food colouring 5 cotton buds.each table put the 3 different food colouring in the bowl of milk then we got the cotton buds and dipped it in the cup of detergent.Then we put it in the bowl of milk  and then the food colouring  started moving around in the bowl and made cool patterns.
Question:what was favourite part of this experiment.