{"id":619436,"date":"2026-01-18T19:44:27","date_gmt":"2026-01-18T18:44:27","guid":{"rendered":"https:\/\/cronologia-universale.it\/march-26-1789\/"},"modified":"2026-01-18T19:44:27","modified_gmt":"2026-01-18T18:44:27","slug":"1774","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/1774\/","title":{"rendered":"1774"},"content":{"rendered":"<p>The Swede Carl Scheele first isolated chlorine and immediately noted its caustic nature: it was green, suffocated, and bleached plants and litmus paper. Chlorine was discovered during one of the great scientific challenges of the time: proving whether all acids contained oxygen. Hydrochloric acid (or muriatic acid, as it was known at the time, from muria, meaning brackish water) did indeed contain chlorine instead of oxygen, but the definitive absence of oxygen would not be demonstrated until 1810 by Humphry Davy.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Swede Carl Scheele first isolated chlorine and immediately noted its caustic nature: it was&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[41],"tags":[],"class_list":["post-619436","post","type-post","status-publish","format-standard","hentry","category-s-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>1774 - Cronologia Universale<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cronologia-universale.it\/en\/1774\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1774 - 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