Soda ash | Old School RuneScape Wiki | Fandom
Soda ash is obtained from cooking seaweed or swamp weed on a range or fire, as a drop from killerwatts, or by mining ash piles. It is an ingredient for making glass in Crafting, along with a bucket of sand. It must then be smelted in a furnace to make molten glass. It can also be purchased at any of the charter ships for approximately 5 coins.