back to The Dragon
In the hermetically sealed vessel, is a three-headed dragon. The dragon not only symbolizes the Matter to be transformed, that is, your mind, at the very beginning of the Great Work.
It is always one and the same substance that is worked on, no matter what its name, symbol or image is. Here it shows that the dragon goes through the three fazes of the Great Work: Blackness, Whiteness and Redness.