Iron gall ink lasts for centuries. Here's how to make it

What is iron gall ink? Only one of the "most important substances in the history of civilization," says Joel Klein , the curator of the History of Medicine and Allied Sciences at the Huntington in San Marino, California. That's because the ink, which is dark blue-gray, sinks into the surface of the paper or parchment and won't fade centuries after it's applied. — Read the rest The post Iron gall ink lasts for centuries. Here's how to make it appeared first on Boing Boing .

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