On RuneScape what does seaweed do?

Answer 1

seaweed is used to produce molten glass. First, you must burn the sea weed via a fire or a stove, producing soda ash. Soda ash + a bucket of sand = molten glass. This molten glass can be shaped into many different objects by using a glassblowing pipe. Molten glass making is actually a very good way to make money, because people level their crafting fast by buying molten glass without going through the motions to make it, thus making it in high demand. Catherby general store gives 80 seaweed per day at 2 gp each everyday if you talk to the owner of it located at the docks. The hand in the sand quest allows Bert to give you 150 free buckets of sand everyday. This can give you about 25k of income just selling the seaweed and sand, but xp can be gained and reasonable profit as well if you take the time to make the molten glass. Molten glass is also used in the Construction skill.