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#chemistry #geology #history #mining #wiki
Historically, alum was employed in a range of medicinal products, as a food preservative and in clarifying water. However, in the 19th century more effective chemical compounds were developed, and alum ceased to be a profitable mining product.
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Saalfeld Fairy Grottoes - Wikipedia
y Kingdom" (Märchendom), featuring a variegated grouping of deposits that, illuminated by theatrical lights and reflected in a perfectly still pool of water, is thought to resemble miniature castles and other buildings. History[edit] <span>Historically, alum was employed in a range of medicinal products, as a food preservative and in clarifying water. However, in the 19th century more effective chemical compounds were developed, and alum ceased to be a profitable mining product. By the 20th century, the Feengrotten had been largely forgotten. But in 1910 the old mine was rediscovered and explorers took note of the fantastic mineral deposits that had accumulated


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