All reagents have a shelf life, whether they are liquids, powders, crystals, tablets, or test-strip pads. If kept dry, powders and crystals are very stable; acids are also long-lived. Date of manufacture is not the controlling factor when it comes to shelf life—storage conditions are more important. As with all perishables, reagents are sensitive to environmental influences and will last longer under controlled conditions.
Reason for Revision
Expiry date vs. Best Before Date - Reagents
U.S. Food and Drug Administration
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Could you tell me a reference to the guideline which describes the self life of volumetric solution? I am looking for a formal guideline. Ok, but there I could not find volumetric solutions method.