Forest glass

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What Wikipedia says

Forest glass (German: Waldglas) is a type of medieval glass produced in northwestern and central Europe from approximately 1000–1700 AD using wood ash and sand as the main raw materials and made in factories known as glasshouses in forest areas.

Excerpt from the Wikipedia article “Forest glass”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ulrich Mayring, CC BY-SA 3.0, via Wikimedia Commons.