Caduceus is a continuation of the older Indo-European dragon-slayer motif. Wilhelm Heinrich Roscher (1913) pointed out that the serpent as an attribute of both Hermes and Asclepius is a variant of the "pre-historic semi-chthonic serpent hero known at Delphi as Python", who in classical mythology is slain by Apollo. One Greek myth of origin of the caduceus is part of the story of Tiresias, who found two snakes copulating and killed the female with his staff. Tiresias was immediately turned into a woman, and so remained until he was able to repeat the act with the male snake seven years later.
Black snake (firework) this firework produces a more impressive snake, but its operation depends upon mercury (II) thiocyanate, which is no longer commonly used because of its toxicity. Black snake (firework) Black snake (or Sugar snake) and Pharaoh's serpent are two similar types of firework. After being lit, both fireworks begin to smoke and spew out ash resembling a snake via an intumescent reaction. They stay on the ground and do not emit sparks, flares, any form of projectiles, or any sound, but may release smoke. Sodium bicarbonate which produces carbon dioxide gas, and sugar forming carbon containing ash, are common chemicals used