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Snake spine

From the RuneScape Wiki, the wiki for all things RuneScape

The Snake spine is a quest item dropped by snakes on Karamja during the Rag and Bone Man quest. The spine must be cleaned by adding it to a pot of vinegar and then boiled in the pot-boiler by the Odd Old Man's house north east of Varrock. Once cleaned it becomes a polished snake spine and can be given to the old man.