Tea Recipe Book
From the Super Mario Wiki
The Tea Recipe Book is an item in Paper Mario: Color Splash. A Ghost Toad in the library of the Dark Bloo Inn tells Mario that he has been tearing the place apart to find the book, which is missing. Mario can find it in room 302, where a Toad can be found reading it. The book is colorless, and Mario must repaint it. Once the book is repainted, the Toad realizes that the book is really boring, so he gives it to Mario. When Mario gives it back to the Ghost Toad, he will go to the tea party.