Fei Kong Hua Shui Shen You Guan (飛空滑水神油罐)

Drawing of Fei Kong Hua Shui Shen You Guan, from 'Wu Bei Zhi (《武備志》)'.

Fei Kong Hua Shui Shen You Guan (飛空滑水神油罐, lit. 'Flying slippery water divine oil jar'), despite the fancy name, was simply a ceramic jar filled with a mixture of egg white and tung oil used for naval warfare. When thrown, the jar broke on impact and spilled out its content, turning the floor (or ship deck) dangerously slippery. Furthermore, the mixture could be set on fire easily due to its tung oil content.