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    "title": "Sterile Technique for Handling Vials",
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    "tldr": "Sterile (aseptic) technique keeps vials and tools free of contamination: clean work surfaces, alcohol-wiped stoppers, single-use swabs and no-touch handling.",
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            "value": "Why the Stopper Is the Weak Point",
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            "q": "Why use 70% isopropyl alcohol instead of a higher concentration to wipe vial stoppers?",
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            "q": "How long should alcohol dry on a vial stopper before inserting a needle?",
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            "q": "What is the critical zone on a laboratory vial and why does it matter?",
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