The part that you can see right now, this is the part that they are dyeing now. The part that they do not want to dye now, they just put in the pot.
As we see, there are several colours already dyed inside the pot. It seems that at the beginning to make sure to change colours after to see exactly which parts he has to dye in blue and red and ... We have also the seam that we can see in there. He has to remove a little bit at the end because of the form of the cloth.