Decanting

From the RuneScape Wiki, the wiki for all things RuneScape

Decanting is the method in which a player combines partially full potions of the same kind to produce one full potion and one partially empty potion. For example, decanting a vial containing 3 doses and another containing 2 doses yields one full potion (4 doses) and one partially full potion (1 dose).

Some players use decanting as a way to make money. They buy potions with doses of 3 in big loads like 1,000 in the Grand Exchange. They decant them and sell the potions for highest on the grand exchange. Players can right-click on Bob Barter to automatically decant potions for you.

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