How do you brake down dry harden graphite?

To break down dry hardened graphite, you can use mechanical methods such as grinding or milling, which involve applying physical force to reduce its size. Chemical methods, like using strong acids or oxidizers, can also help to break down graphite by altering its structure. Additionally, thermal methods, such as heating the graphite at high temperatures in an inert atmosphere, can facilitate its breakdown. Always ensure proper safety measures are in place when using these methods.