Favor non-destructive testing over destructive testing.
Base proposals for destructive testing on a detailed Treatment
Recommendations and a Record of Decision.
Retain samples as part of the architectural fragments collection.
Interpret these treatments for the public and professionals.
"Destructive Analysis and Consumptive Use: After careful
review, if the benefits can be clearly shown to outweigh the resulting
or potential damage or loss, approve destructive analysis of rare
or highly significant objects, specimens, and archival items,
and any consumptive use of museum collections."
Destructive Analysis and Consumptive Use, section 4.2.7 Directors
Order #24 NPS Museum Collection Management, August 21, 2000.