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Moment of truth
More than 25 million people died in Europe from the bubonic plague (the black death) in five years, from 1347 to 1352.


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slaked lime Chem.
Also known as hydrated lime or common name for calcium hydroxide. It is formed by adding water to quicklime (calcium oxide). It is a white crystalline powder slightly soluble in water to give a clear weak alkaline solution called lime water. The solution is commonly used to test for the presence of carbon dioxide which gives a white precipitate of calcium carbonate. Slaked lime is also used in sugar refining, mortar, plaster and soil treatment.

smelting Min. Ext.
The metallurgical process of separating a metal from its ore by heating the ore to a high temperature with a reducing agent such as carbon coke. For iron, smelting usually occurs in a blast furnace but for other metals, it can occur in a reverberatory furnace or electric furnace.

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