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In the olden days -- back when kids played with mercury and ate lead paint -- the great Pharoah's Serpent was made with a little chemical called mercury thiocyanate. Now though, it's made with a less toxic, but also less impressive, sodium bicarbonate. But what is Pharoah's Serpent? Other than your worst nightmare, that is.

After lighting the small tablet, the firework starts smoking and an ash resembling a snake is expelled. They stay on the ground and do not emit sparks, flares, any form of projectiles, or any sound, but may release smoke.