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Ampoules often have colored rings of paint or enamel around their necks. Color coding of modern ampoules is done during the manufacturing process. A machine paints colored rings on the ampoule shortly after it's been sealed. The rings are made of a substance that is readable by other machines. These color codes identify the substance inside the ampoule so that it does not need to be tested to verify the contents. The machine-readable color codes allow for accurate handling of the substance for the purposes of storage, labeling, and secondary packaging

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Q: Why the colors of the ampules are different?
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