recipe from his ("The Book of Secrets"):However, it appears that in most of his experiments al-Razi disregarded the gaseous products, concentrating instead on the color changes that could be effected in the residue. According to Robert P. Multhauf, hydrogen chloride was produced many times without clear recognition that, by dissolving it in water, hydrochloric acid may be produced.

11th-13th century

Drawing on al-Razi's experiments, the De aluminibus et salibus ("On Alums

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