lilac & sodium

LITSodium's flame is the D doublet at 588.995 and 589.592 nm, a single spectral orange. Potassium's visible flame lines are a violet pair at 404.414 and 404.721 nm and a deep-red pair at 766.490 and 769.896 nm (NIST Handbook of Basic Atomic Spectroscopic Data). Lilac is what the eye makes of the two ends at once: a purple, which is non-spectral. Chemists view potassium through cobalt-blue glass to cut the sodium glare.

COMPUTEDAn honest surprise from the real tables: at 766 nm the eye's response (ȳ) is about a thousandth of its peak, so the red pair counts only if the flame puts much more power into it than into the violet pair. With the violet weighted equally or more, the mix lands on the violet end of the spectral locus, right at the corner where the line of purples starts. Lilac is a borderline purple; real flames add continuum light, and this line-only model leaves it out.

COMPUTEDEach flame colour on this page is computed from those lines with the CIE 1931 2° functions, then mapped to sRGB. MODELThe violet:red intensity ratio is a free slider, since real ratios depend on the flame and the detector. Lilac core, sodium shell, void beyond, or the other way round with "swap nesting".

K violet : red Na contamination cobalt glassswap nesting

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