Glass Message Board
Glass Identification - Post here for all ID requests => Glass => Topic started by: Frank on July 14, 2008, 12:57:20 PM
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Kelp was a major product in medieval Scotland and widely used in the soap and glass industries - first used in soap then the waste used in glass. The Scots also made extensive use of ferns and seaweed to obtain glass ingredients.
http://en.wikipedia.org/wiki/Glasswort
Not the reason early glass was often green though!