Looking at the other videos it’s just common sense; anything that carbonises is resistant, because carbon is stable up to very high temperatures in the absence of air, and the ball of nickel excludes the air from the interface.
This is just as well because red hot carbon exposed to air results in poisonous carbon monoxide, and red hot carbon monoxide and nickel react to form the extremely poisonous nickel carbonyl - even 3 parts per million in air can be fatal. Try this experiment with the wrong substance and no ventilation and it might be the last one you ever do.
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