![Penguin Books UK on Twitter: ""Why do the pages in old books turn yellow?" we've often asked ourselves. Now we know: http://t.co/NMHJM7BBJU http://t.co/5jBVDjF7xL" / Twitter Penguin Books UK on Twitter: ""Why do the pages in old books turn yellow?" we've often asked ourselves. Now we know: http://t.co/NMHJM7BBJU http://t.co/5jBVDjF7xL" / Twitter](https://pbs.twimg.com/media/CFCXMSjWIAA25Ye.jpg)
Penguin Books UK on Twitter: ""Why do the pages in old books turn yellow?" we've often asked ourselves. Now we know: http://t.co/NMHJM7BBJU http://t.co/5jBVDjF7xL" / Twitter
Ateneo Chemistry Society on Twitter: "Lignin must then be extracted from the cellulose to produce white paper. However, separating lignin from cellulose can be a relatively expensive and challenging process, which causes
![Paper or Page Turning Over Bottom Left Yellow Stock Vector - Illustration of note, paperboard: 121097083 Paper or Page Turning Over Bottom Left Yellow Stock Vector - Illustration of note, paperboard: 121097083](https://thumbs.dreamstime.com/b/yellow-paper-page-turning-over-bottom-left-side-paper-page-turning-over-bottom-left-yellow-121097083.jpg)