We love the colours on these...
Trapped air bubbles, and a rainbow of colour.
It's just a large sandwich bag ( plastic bag) with 3 blobs of paint: primary colours.
Squish and squash together and attach to window with Blu-tak.
They can play with it all day on the window as it takes a day or so to dry...
Blending and merging. Looks so beautiful!
Lovely autumnal colours.