Some thing and copper snake - Thing on the left was my practice casting. It is solid silver.
On right, that snake is made using casting. First I made snake from wax, then I attached the wax snake to the "casting tree" and lastly the hole thing was covered with gypsum. After the burning, the casting itself was performed. Then I sand down the snake and at the last step, I verdigrised the whole thing and polish up the spots which I wanted to be clean and shine :)