Freeze-dried material is stable for a long time when stored properly, but a lab report describes the batch on the day it was tested. A retest date sets when the report should be refreshed, particularly for slow-moving stock.
Retest date
The date by which a batch should be tested again to confirm it still meets its specification.
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Purity does the work these terms describe: batches held until their lab report is in, payments matched to orders, and wording checked before it sends.