All light sources should be filtered for UV radiation. Where possible, the repository selected for curation should be in the same state as the site or in a facility which stores materials from the same region. Preference should be given to a facility which curates other collections from the same site or site area. This is because discard or deaccessioning can jeopardize the ability to study the primary site data. In particular, current levels of knowledge may not adequately recognize the research value of certain artifacts classes.
Exceptions are live ammunition, toxic or radioactive materials and other hazardous substances.
However, deactivation of historic ammunition rather than its discard is suggested to preserve this often rare class of material culture. In decisions regarding any deaccessioning, materials recovered from good archaeological contexts should be given the greatest priority for retention. Effort should be made to first find a repository which will accept material to be deaccessioned. If unsuccessful placement in a stable environmental setting which permits later retrieval of the material is strongly encouraged. Decisions about any deaccessioning of archaeological materials should be made by or in consultation with professional archaeologists.