Shelf Life Tips
- How long does alum powder last? The precise answer depends to a large extent on storage conditions - to maximize the shelf life of alum powder store in a cool, dark cupboard, away from direct heat or sunlight.
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How long does alum powder last at room temperature? Properly stored, alum powder will generally stay at best quality for about 2 to 3 years.
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To maximize the shelf life of alum powder purchased in bulk, store in containers with tight-fitting lids.
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Is alum powder safe to use after the "expiration" date on the package? Yes, provided it is properly stored and the package is undamaged - commercially packaged alum powder will typically carry a "Best By," "Best if Used By," "Best Before," or "Best When Used By" date but this is not a safety date, it is the manufacturer's estimate of how long the alum powder will remain at peak quality.
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Does alum powder ever spoil? No, commercially packaged alum powder does not spoil, but it will start to lose effectiveness over time - the storage time shown is for best quality only.
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