Stacking colours

On Wednesday my class went to room 13 for science . We got a straw and stuck it in coloured water and then put our thumb on the top of the straw & lifted it up and across to another bowl. Then we put the straw in to the water again and let go with your thumb and put it on again and hung it over a spare bowl & let go. Then we looked at the blob your straw made. Did your colours stack?