The storage time of parchment is related to its types and storage conditions. Ordinary parchment could have been preserved for hundreds of years, while some rare sheepskins in ancient books could have been preserved for thousands of years, and even passed down as orphans.
The material of parchment is easily influenced by the environment, such as temperature, humidity and light, which leads to the aging, decay and damage of parchment. In the process of making sheepskin, natural materials such as sheepskin are used, and the materials themselves are easily eroded by microorganisms such as bacteria and molds, resulting in damage to sheepskin.