I'm fairly new to AE. I have a shape that I want to change color through some sort of animation. I made two copies of my shape, one in grey and one in green. I overlapped them in AE, and used the liquify-warp tool to make it look like the grey was slowly being sucked out and replaced by the green color. My problem is whenever I'm almost done & at 1% of grey left, I can't get it to go away completely. A little bit of grey is always left. What am I doing wrong?