Chokoleti cha petroleum chopangidwa ndi grafiti ndi kusintha chokoleti cha petroleum kukhala chokoleti cha kaboni chokhala ndi magawo atatu pa kutentha kwakukulu kwa madigiri pafupifupi 3000 mu uvuni wa graphitization, ndiko kuti, chokoleti cha petroleum chimakhala graphite. Njirayi imatchedwa graphitization. Chokoleti cha petroleum chomwe chimakonzedwa kudzera mu graphitization chimatchedwa chokoleti cha petroleum chopangidwa ndi grafiti.
