_Sample.Preparation_expiration_date
| Description | Date after which the sample should not be used. |
| Details: | |
| Parent saveframe | sample |
| Data type | yyyy-mm-dd |
| DB table | Sample |
| DB column | Preparation_expiration_date |
| DB type | DATETIME year to day |
| NULL allowed | yes |
| ADIT-NMR deposition system prompt | Preparation expiration date |