[eli5] Why does the lignum has to be removed from wood in the process of paper making?

Question

[eli5] Why does the lignum has to be removed from wood in the process of paper making?

In: 5

Answer 1

As others have said, it makes the paper yellow over time..

Newspaper contains high amounts of lignin, which is why it yellows so quickly in comparison to other paper.

Lignin can also essentially leech into other materials pressed against it, which is why you’ll find professional framing shops advertising ‘acid and lignin free’ materials.