what causes paper to yellow
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 for example newspapers are made from groundwood pulp and the acids in the paper cause it to discolour and become brittle breakdown of the newspaper from within speeds up with exposure to light and or high humidity