Molten glass

Molten glass is used in the Crafting and Construction skills, as well as some quests, to form glass items.

Molten glass can be created through the Crafting skill by using a bucket of sand and soda ash on a furnace, granting 20 Crafting experience. Alternatively, you can use the lunar spell Superglass Make, which converts all buckets of sand and all seaweed or soda ash into molten glass, still granting experience.

In order to make many of the items, you have to use a glassblowing pipe.