Harry dropped the hair into the mudlike liquid. The moment it made contact with its surface, the potion began to froth and smoke, then, all at once, it turned into a clear, bright gold.
“Ooh, you look much tastier than Crabbe and Goyle, Harry,” said Hermione, before catching sight of Ron’s raised eyebrows, blushing slightly, and saying, “Oh, you know what I mean — Goyle’s potion looked like bogies.”

Harry Potter and the Deathly Hallows – J.K. Rowling