Koping, Sweden/koping190

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Label to previous exhibit. The publication was refused by Tobern Bergman in Uppsala, never to be published. Although the research concentrated on the formation of iron balls from a boiling mixture of iron powder and cream of tartar, historically more important was Scheele's observation that weak acids produced hydrogen when reacted with iron, as well as hydrochloric and sulfuric acid (Cavendish, the discoverer of hydrogen, only knew about the latter two acids).