It's hard to remove a lot of graphite powder on the glass cake. Who has a good way to remove the graphite powder above?
Suggestion: use a certain amount of concentrated nitric acid infiltrated graphite part, nitrate solution the best there is a certain amount of 1-2 weeks (timing can also be placed with a glass rod, pour stirred) acid, diluted with water to acid and then scrub brush. Because the temperature nitric acid reaction is very slow, but the long-term infiltration, the graphite surface. Especially with the glass contact surfaces may be immersed in a small amount of acid, oxidation, then scrub may have the effect.
Graphite is chemically stable (inert), to eliminate it used two methods: one is under the condition of high temperature combustion has sufficient oxygen to remove (heating in a muffle furnace effects are poor), certainly not with the glass bottle; two with hot concentrated sulfuric acid, concentrated nitric acid oxidation to remove heat, if not heating your glass bottle this method, also difficult.
Just add some water and rub it over and over again with wooden sticks or bamboo strips. The effect will be better with water. Do not use hard objects such as glass bars, or your glass becomes a flower.
