The Aroma Of Books
People often found saying that their old books got different kind of smell as compared to new one. Well, I heard this thing from one-to-many times while the same I think you too heard for the number of times. To help you understand this, you need to understand the science which is actually causing it. This is where I believe the infographic below which was posted by a British chemistry teacher, Andy Brunning on his blog, will help you out real more.
Source: Compound Chem