In 1767, Swedish chemist Torbern Bergman synthesized alum by boiling alunite in sulfuric acid and introducing potash to the solution. He also synthesized alum as a response solution among sulfates of potassium and earth of alum, demonstrating that alum was a double salt. Half of the space between two atoms https://freebusinessmall.blogkoo.com/the-aluminium-diaries-48262536