Welcome to Harry Potter Answers. What would you like to know?

It's not the Polyjuice Potion, but the Draught of Living Death, where clockwise stirs come into play. During a Potions lesson in Half-Blood Prince, Harry is brewing the Draught of Living Death, and one of the handwritten notes in his Advanced Potion-Making book says to add one clockwise stir after every seven counterclockwise stirs to finish the Draught faster.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.