Final answer:
For newspaper preservation in dry mounting, acid-free foam board is recommended to prevent ghosting, which is the unwanted transfer of print materials.
Step-by-step explanation:
When it comes to the preservation of newspapers during the process of dry mounting, it is highly recommended to use acid-free foam board. The reason for this is to prevent a phenomenon known as 'ghosting', which refers to the transfer or seeping of print materials from one layer to another over time. Acid-free materials are critical in archival processes because they do not contain acids that can break down the paper fibers of the newspaper, thereby ensuring the longevity and integrity of the document.