Amortentia

In the Harry Potter series, Amortentia is the strongest Love Potion in the world. In the first Potions Class in Year Six at Hogwarts, Professor Slughorn has four cauldrons full of potion, all of them clearly identified by Hermione Granger. They were Veritaserum, Polyjuice Potion, Felix Felicis and Amortentia. You can recognize Amortentia by its distinctive mother-of-pearl sheen, its steam rising in characteristic spirals and how it smells. It smells differently to everybody according to what attracts them. We are told how Harry Potter (character) and Hermione Granger perceive the potion. Harry is reminded of treacle tart, a broomstick, and "something flowery he might have smelled at the Burrow", which the reader can infer by the end of the book to be the smell of Ginny Weasley. To Hermione it smells like freshly mown grass and new parchment--and something else, but we're not told what (most likely something related to Ron Weasley).