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Apr 13 at 2:41 vote accept jmadden
Apr 5 at 3:08 comment added niels nielsen @jmadden, there's sodium contamination everywhere. flame spectroscopy requires it be removed carefully so it doesn't get in the way of your measurements.
Apr 4 at 22:06 comment added BowlOfRed @jmadden The sodium line is quite bright. It can be visible even if sodium is present as a contaminant. Without calibration, it's hard to say if that's what your line is. But it would be good to rule it out as a first step because it's just so common.
Apr 4 at 20:11 comment added jmadden @BowlOfRed mentioned sodium too. Where would sodium be coming from? Sodium does not seem to be an ingredient in matches from what I've been reading.
Apr 4 at 19:27 history answered niels nielsen CC BY-SA 4.0