Final answer:
In dry mounting, a protective sheet is placed between the artwork and the Dry Mount lid to protect the artwork from heat and adhesion damage.
Step-by-step explanation:
When mounting artwork using a dry mount process, the item that goes between the Dry Mount lid and the artwork is a protective sheet. This sheet is essential as it protects the surface of the artwork from any potential damage that could be caused by the heat or adhesion process.
A protective sheet ensures that no direct contact occurs between the artwork and the pressing device to avoid any possibility of the artwork getting scorched or adhering to the lid.