Question

why pages of old books are yellowish in colour?​

Answer 1

Answer:

But lignin, and in part cellulose, is susceptible to oxidation — meaning it readily picks up extra oxygen molecules, and those molecules alter the polymer's structure. ... In the case of lignin oxidation, that color is yellow or brown.

Acidity is one of the most important causes of damage in paper as it weakens and eventually destroys the fibres that make up the paper. As a result, paper made from groundwood pulp breaks down rapidly from within. The first sign of this is that the paper becomes yellow, then brown, and increasingly brittle.

Hope it may help u

Answer 2

Answer:

But lignin, and in part cellulose, is susceptible to oxidation — meaning it readily picks up extra oxygen molecules, and those molecules alter the polymer's structure. ... In the case of lignin oxidation, that color is yellow or brown.