In the winter of the tenth year of Zhenguan, there was a heavy snowstorm in Qinzhou. 12-Year-old Song Ziming crouched under the window of his family's school and eavesdropped. He fainted due to hunger and was rescued by his teacher. That night when he was making a charcoal basin for his sick mother, he almost got poisoned, but he accidentally discovered the method of purifying charcoal. The clan elders scolded him for "defiling the writings of saints and sages with his lowly deeds", so he broke a piece of charcoal and swore: "This hand can make utensils and hold a red pen!"
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