Emerald chooses the invisibility potion.

"I see! And soon, I won't!" Joyride says, chuckling.

"So here is your first lesson. To make a potion with the effect you want you'll have to find ingredients with those characteristics. For instance, if you want to make an invisibility potion we'll need ingredients that have the characteristics of being invisible. Your first assignment is to think of what two of the ingredients might help you make such a potion." Joyride says nodding, "One should be pretty obvious, the other you might have to think out of the box a bit."

What does Emerald say?