*Walks up to the table*

Hi, madame Rowena. I was wondering if you could help me with my Potions Class. It seems that I can never get any potion to thicken even though I have done every step correctly and in order. So my questions are these: Does the type of cauldron affect your potions, and Does it matter which supplier you get your potion ingredients from?

*Waits for Madame Rowena to find a book....*