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

Odds are he had it brewed for a while or that the potions classroom keeps potions like that around to show the students should they ask questions.

There was no mention of the shelf life of this potion.

It was probably on the shelf, because i remember Slughorn walking back over to the shelf.

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.