The process by which an object is formally included in the collection is called accessioning and each object is given a unique accession number.
Video link:
Published on Oct 2, 2015
Amanda Streeter Trum, Museum Curator of Collections, shows us this circa 1900 wax replica of a mange mite produced in Paris and later given to Dr. William Butler, Montana State Veterinary Surgeon, by a parasitologist practicing in France. Enjoy this model of a mange mite, Psoroptes communis, (Accession Number 2012.43.04) in the 32nd video of the Hidden History Highlighted series.
When a museum gets rid of an object, they must do so in the appropriate manner. Each museum would have its own policy of deaccessioning objects.
Deaccession is the removal of an object from a museum's permanent collection. Recognizing there is a need for a universal standard many museums are trying to synthesize previous museum practices so that we can towards a universal standard.
TEXTS:
As Museums Try To Make Ends Meet, 'Deaccession' Is The Art World's Dirty Word
Data Base Example: Important Museum Accessions in 1950
Art & the Law :: Museums with Walls - Public Regulation of Deaccessioning and Disposal
Handbook for Museums :: David Dean & Gary Edson
Registration Methods for the Small Museums :: Daniel B. Reibel
Day in the Life of a Historical Textile Collections Curator
Collection the New: a historical introduction