Master Geng ( Chinese: 耿先生; pinyin: Gěng Xiānshēng; Wade–Giles: Kêng3 Hsien1-shêng1, fl. c. 975) was a Chinese alchemist. [1] She was the daughter of Geng Qian. [2] Legend says that during her adolescence she already demonstrated her intelligence and curiosity, and developed skills in the alchemical arts. [3] Eventually, her skills drew the attention of emperor Xuanzong, who invited her to the palace. [1] Within the palace, rather than being counted as one of the palace women, she was honoured as a scholar, and given the title Master (or Teacher). [2] Whenever she had an audience, she spoke confidently and eloquently, always wearing green robes. [3] She is described as performing alchemical transformations, as well as dabbling in divination. [3] Most of her alchemy focused on creating silver, and tales tell of her ability to use mercury to turn even snow into silver. [4] This, some modern chemists have proposed, might be an example of a legitimate chemical process in which mercury is used to extra silver from ores. [1] She may have also distilled perfumes, and utilized an early form of the Soxhlet process to extract camphor into alcohol. [1] [4] In her personal life, Geng was noted as enjoying wine, and romantic and sexual dalliances. [3]