Kwuarm potion (unf) are used to create Super strength and Weapon poisons. Because antifires are often used to train Herblore, and adding Clean kwuarm to a Vial of water gives little experience, many players avoid the tedium of making unfinished potions and buy them directly from the Grand Exchange. This opens up an opportunity to make unfinished Kwuarm potions for profit. Once you've finished making your potions, sell them on the Grand Exchange. Maximize your profit by buying one unfinished potion instantly, and selling all of yours for slightly less than that.