What does it mean when a museum deaccessions part of its collection?

Deaccessioning is the formal process of removing an object from a museum's permanent collection. It is usually done when an item no longer fits the mission, is a duplicate, has deteriorated beyond reasonable care, or was found to be something other than what it was thought to be.

Reputable museums follow written policies, often requiring curator review and board approval. Professional museum guidelines generally expect proceeds from any sale to be used for the collection, such as acquiring new objects or caring for existing ones, rather than for general operating costs.

Deaccessioned items may be transferred to another museum, returned to an appropriate group, or sold, sometimes at public auction. If you donated an item, your deed of gift typically does not guarantee the museum will keep it forever, so ask about their policy up front.