This is a fantastic visual and stirs up excitement as the children watch the carbon snake grow. Here's how to try it out yourself, but ple.
How to Make a Pharaoh's Snake Firework Safely
Make a Pharaoh's Snake Firework (Safely): Pharaoh's snakes are a type of firework in which a lighted tablet exudes smoke and ash in a form sinuous form that resembles a snake. The original formulation for pharoah's snakes is toxic so the firework is only made as a chemistry demonstration.