Wholesale old book smell molecule necklace. The smell of an old book is a combination of many compounds including acetic acid, furfural, benzaldehyde, hexanol, and vanillin, the molecules shown on this necklace. This necklace is a fun and unique way to enjoy the smell of library or bookstore. The pendants are made of stainless steel, the necklace is a sterling-silver plated 18" curb chain, and the jump rings are sterling silver.