RuneScape Classic Wiki
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RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Seaweed
The Old School RuneScape Wiki also has an article on Seaweed.

Are you looking for Edible seaweed?

Seaweed is one of the ingredients needed to Craft glass. Seaweed can be obtained by Fishing with a Big Net or from 4 spawns on the north western shore of Entrana. Seaweed must then be cooked on a range in order to turn it into soda ash. To make molten glass, use the sand on a furnace with soda ash in your inventory. The molten glass can then be blown with a glassblowing pipe to create 3 different items, see below.

Glassblowing

Image Name Level Experience
Beer glass.png Beer glass 3 17.5
Vial.png Vial 33 35
Unpowered orb.png Orb 46 52.5