Browning of paper in old books is caused by

A. Frequent use

B. Lack of aeration

C. Collection of dust

D. Oxidation of cellulose

Answer: Option D

Solution(By Examveda Team)

Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.