Context: Paper made from mechanical pulp contains significant amounts of lignin, a major component in wood. In the presence of light and oxygen, lignin reacts to give yellow materials, which is why newsprint and other mechanical paper yellows with age. Paper made from bleached kraft or sulfite pulps does not contain significant amounts of lignin and is therefore better suited for books, documents and other applications where whiteness of the paper is essential.

Question: What particle is associated with the yellowing of newspapers?
Answer: lignin

Question: A book is likely made with paper that has low amounts of what component of wood?
Answer: lignin

Question: What does lignin react to to produce the yellowing you see in newspapers?
Answer: light and oxygen

Question: What does lignin made from mechanical pulp contain significant amounts of?
Answer: Unanswerable

Question: What is a major component of lignin?
Answer: Unanswerable

Question: When lacking light and oxygen, what type of materials does lignin react to give?
Answer: Unanswerable

Question: What does paper made from bleached kraft contain a significant amount of?
Answer: Unanswerable

Question: What does paper made from sulfite pulps contain a significant amount of?
Answer: Unanswerable

Question: What particle is associated with the greening of newspapers?
Answer: Unanswerable

Question: A book is likely made with paper that has high amounts of what component of wood?
Answer: Unanswerable

Question: What does lignin react to to produce the greening you see in newspapers?
Answer: Unanswerable