Tag: corrosion

When Good Flowerbeds Go Bad: A Story of Chemistry in Action

By Veronique Greenwood | December 30, 2011 8:43 am

belgrade
White gates turning black in Belgrade.

Once upon a time, long, long ago, a fortress of white limestone was built between the River Sava and the Danube in what is now Serbia. It later gave its name—Belgrade, or “white fortress”—to the city that sprang up within and outside its walls, and in the twenty-first century, after more than a millennium of attacks by Huns, Bulgarians, Byzantines, more Bulgarians, Turks, and what-have-you, Belgrade fortress met its harshest enemy yet: fertilizer.

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