How to mix silicone in acrylic pouring mix:
The perfect recipe will take some time and experimentation to find, but a good starting point would be the following:
1 part acrylic paint: 1.5 parts pouring medium: 2-3 drops of silicone.
Only add silicone to the colours where you want the cells to appear. Experiment with side by side tests to find the final result you want to achieve.