The process of browning of paper in old books is known as :

Correct option is C

The correct answer is:(c) Foxing

Explanation:

• The browning or spotting of paper in old books is known as foxing. It appears as reddish-brown spots due to oxidation of iron particles and fungal growth on acidic paper over time.

Information Booster:

• Foxing is common in books stored in humid and damp conditions.

• It doesn't usually weaken paper structurally but affects its appearance.

• Both metallic impurities and mold spores contribute to foxing.

• Preventive conservation includes climate control and deacidification.

• Foxing is a major concern in archival preservation.

• It is more common in pre-20th century books printed on wood pulp paper.