Why New Books Smell So Good - The Chemistry of Paper and Ink That Creates the 'Book Scent'

There Are Two Types of Book Smell

If you're a book lover, you've surely experienced the happiness of walking into a bookstore and catching that scent, or opening a brand-new book and breathing in its aroma. In fact, there are broadly two types of "book smell" - the "new book smell" and the "old book smell." And these two come from chemically completely different substances.

What Makes New Books Smell

The smell of a new book comes primarily from three sources.

First, the paper itself. Modern book paper is made from wood pulp, and trace amounts of volatile organic compounds (VOCs) are released from the bleaching agents and adhesives used in the manufacturing process.

Second, the printing ink. The ink used in offset printing contains solvents that volatilize and produce a distinctive smell. Color-printed books smell stronger than monochrome ones because color inks contain more solvents.

Third, the binding adhesive. Hot-melt adhesive used to secure the spine also releases volatile components. The reason a new book smells particularly strong near the spine when you open it is because of this adhesive. (You can learn more from books on the science of paper)

What Makes Old Books Smell

The smell of an antiquarian bookshop is entirely different from that of new books. A sweet aroma reminiscent of vanilla, almonds, and chocolate. The source of this smell is chemical compounds generated by the aging degradation of paper.

A research team at University College London detected volatile compounds from old books including vanillin (the scent component of vanilla), benzaldehyde (the scent of almonds), and furfural (the scent of sweet bread). These are produced when cellulose and lignin, the main components of paper, break down over time.

In other words, the sweet smell of old books is "the smell of paper slowly decomposing." It's a somewhat bittersweet fact, but because this decomposition process takes hundreds of years, old books possess their uniquely charming fragrance.

Why Does the Book Smell Feel 'Good'?

Many of the chemical compounds that make up the book smell are shared with food aromas. Vanillin is the scent of vanilla ice cream, benzaldehyde is the scent of almonds, and furfural is the scent of freshly baked bread. The brain processes these smells by associating them with "food = safe = comfortable," which is why the book smell feels pleasant.

Furthermore, the book smell has a powerful memory-evoking effect. Among the five senses, smell is the only one directly connected to the limbic system (the center of emotion and memory). Memories of time spent in the library as a child, the memory of the first paperback you ever bought. The book smell instantly recalls these memories, bringing nostalgia and a sense of comfort. (Books on scent and memory are also a helpful reference)

The Value of 'Smell' in the Digital Age

E-books have no smell. This may seem trivial, but it affects the richness of the reading experience. Picking up a paper book, turning the pages, and smelling it. This multisensory experience may be one reason behind the enduring attachment to physical books.

Summary

The smell of new books comes from volatile components of paper, ink, and adhesive, while the smell of old books comes from the decomposition products of cellulose and lignin. Both contain compounds shared with food aromas, so the brain perceives them as "pleasant." If you love the smell of books, take a deep breath the next time you walk into a bookstore. What you're inhaling is a chemical harmony performed by paper, ink, and adhesive.