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How Is Black Fire Made?



The Royal Institution

Sodium flames can appear black in the light of a sodium lamp. Natasha explains the physics behind it.
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34 thoughts on “How Is Black Fire Made?
  1. You should do more of these 'giveย full, scientific, lay-friendlyย explanations of things we've seen on YouTube' videos. They're great and often fill important gaps left by other creators.

  2. U guys say Science
    We say jutsu
    U guys say Black Fire
    We say AMATERASU!!!

    AND IT'S NOT CALLED WITCH CRAFT! IT'S CALLED ONE OF THE ULTIMATE JUTSU EXISTS IN UCHIHA CLAN!

  3. Really nice explanation and intriguing experiment. I actually have one question. How do the sodium atoms end up in the flame? I would not expect the NaCl to be vaporizer or ionized from being in the methanol to being in the flame. But they need to be in the flame to absorp the light and give the black color…

  4. ู‚ุงู„ ุฑุณูˆู„ ุงู„ู„ู‡ ุตู„ู‰ ุงู„ู„ู‡ ุนู„ูŠู‡ ูˆุณู„ู…: ((ูŠุง ุฌุจุฑูŠู„ ุตูู ู„ูŠ ุฌู‡ู†ู… )) ู‚ุงู„: ู†ุนู…ุŒ ุฅู† ุงู„ู„ู‡ ุชุนุงู„ู‰ ู„ู…ู‘ุง ุฎู„ู‚ ุฌู‡ู†ู… ุฃูˆู‚ุฏ ุนู„ูŠู‡ุง ุฃู„ู ุณู†ุฉ ูุงุญู’ู…ูŽุฑู‘ุชุŒ ุซู… ุฃูˆู‚ุฏ ุนู„ูŠู‡ุง ุฃู„ู ุณู†ุฉ ูุงุจู’ูŠูŽุถู‘ุชุŒ ุซู… ุฃูˆู‚ุฏ ุนู„ูŠู‡ุง ุฃู„ู ุณู†ุฉ ูุงุณู’ูˆูŽุฏู‘ุชุŒ ูู‡ูŠ ุณูˆุฏุงุก ู…ูุธู„ู…ุฉ ู„ุง ูŠู†ุทูุฆ ู„ู‡ุจู‡ุง ูˆู„ุง ุฌู…ุฑู‡ุง . ูˆุงู„ุฐูŠ ุจุนุซูƒ ุจุงู„ุญู‚ุŒ ู„ูˆ ุฃู† ุฎูุฑู’ู… ุฅุจุฑุฉ ููุชูุญูŽ ู…ู†ู‡ุง ู„ุงุญุชุฑู‚ ุฃู‡ู„ ุงู„ุฏู†ูŠุง ุนู† ุขุฎุฑู‡ู… ู…ู† ุญุฑู‘ู‡ุง ..

  5. Ah, but where can one purchase such a light fixture in the US? The bulbs seem plentiful, but not the external igniter for a low pressure sodium lamp. Would high-pressure lamps work at all?

  6. Wonderfull demonstration!
    I have installed a 26W sodium lamp, very similar to yours.
    But i have dificulties with the flame. It only looks partially dark. It does not look so much yellow either in the day light. Maybe the flame is not so hot. Or may be the solution is not concentrated enough. Could you give me some advice on preparing a solution for a dark flame.
    Thank you.

  7. how did you dissolved salt in ethanol? Iv tried, but it wouldnt dissolve directly, so i tried dissolving it in water and then maxing with ethanol – result was far from black flame – it had black tips, but thats it… what im i doing wrong?

  8. I don't understand why apparently the sodium atoms in the flame absorb the electromagnetic waves but do not re-emit them, the atoms' electrons remain energized and excited forever? This doesn't even make sense

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