Paper can be made from different things, like wood, cotton, or recycled materials. These materials have different properties, which can affect how long the paper lasts. When paper is made, it can be treated with something called an acid. This makes the paper stronger and helps it hold its shape better.
But over time, the acid in the paper can start to break it down. This can make the paper turn yellow or brittle, and it can also affect the ink or paint on the page. When paper is made with too much acid, it can become what we call "acidic paper." This means that the paper is not very stable and could deteriorate more quickly than other types of paper.
To avoid using and preserving acidic paper, people can choose to use archival-quality paper or acid-free paper, which is made without the acid that causes the paper to degrade. This will help ensure that the paper lasts for a very long time and that the information, pictures, or drawings on it can be enjoyed for generations to come.