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Seaweed is used to create soda ash by burning it on a range or fire. This gives 1 Cooking XP or 3 Cooking XP if a Dwarven Army Axe is worn.
Seaweed, along with a bucket of sand can be converted to molten glass using the Superglass Make spell in the Lunar Spellbook.
Seaweed can be ground into ground seaweed with a pestle and mortar for 1 Cooking XP.
Seaweed can be purchased from Arhein in Catherby for 2 coins each by talking to him. He will sell 80 noted seaweed per day. Seaweed can also be found along the ground near many shores.