If you're as ancient as I am, you might remember that awesome line of Revell "Visible" model kits: The Visible Man, Visible Woman, Visible V-8, Visible Mustang, etc. These see-thru models were a fun way to teach kids what lies beneath the surfaces of biological and mechanical worlds. I loved these kits!
Now, thanks to the wonders of modern desktop animation, we have this video of four transparent rockets showing engine burn and staging, from launch to orbital insertion.
Red = Kerosene RP-1
Orange = Liquid Hydrogen LH2
Blue = Liquid Oxygen LOX