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

Swamp tar is found as several spawns in the Lumbridge swamp and the swamp in the Tree Gnome Stronghold. You can add flour to it and cook it over a fire to make swamp paste.