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Codeine: Melting Point: 154 - 156°C

Morphine:

Melting Point: 255°C (sulfate salt)

So one could have a controlled burn of each powder on a hot plate with temp gauge and notice what temp the solid melts at. Thus determining what of the two substances the unknown is and possibly determining purity.

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Q: How would a lab quickly decide if a white powder was codeine or morphine?
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