To remove the black and restore your pot to new, pour in a can of coke (or as much as you need to cover the blackened area by an inch) and put it on the stove on a low heat.
为了消除顽固黑斑，恢复原锅新貌，只用向其中倒入一罐可乐(或者只要刚好覆盖着变黑的地方就行)然后放在小火的火炉上。
The paper introduces the process, process design and achieved economic and social benefit of charcoal black production in which coke oven gas takes the place of fuel oil.
介绍了河南天宏焦化（集团）有限责任公司开发、应用焦炉煤气替代燃料油生产炭黑的工艺流程、工艺设计及取得的经济、社会效益。
Catalytic cracking oil slurry after filtration separation can be used to manufacture carbon black, needle coke, carbon fibrous material, plasticizer and so on.
过滤后的油浆可作为炭黑针状焦、碳素纤维材料、增塑剂等产品的原料，最后对催化裂化油浆过滤技术进行了展望。
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