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I am working on a story for adaptation into animation. Main lead is a chemist in a traditional fantasy setting. The chemist uses her own compound to battle using fire or explosions. I love the chemistry to be grounded. I am looking for a very combustible gas or liquid that has a color. Preferably green-blueish. Preferably lighter than air. Does this exist? Any other suggestions about other cool looking compounds are very welcome.

Poutnik
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Steven Hanssen
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    This is not going to be well received here; maybe it would work at worldbuilding. For chemistry it is too vague and if you get the chemistry right, it wouldn't be exciting for your viewers. – Martin - マーチン Aug 25 '21 at 20:39
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    The only gases which are combustible and lighter than air are Hydrogen $\ce{H2}$ and methane $\ce{CH4}$ ; unfortunately these gases are colorless. – Maurice Aug 25 '21 at 20:49
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    Please look at the table here. I would use a mixture of trifluoronitrosomethane (for color) plus hydrogen and oxygen. And, if that answer is useful to you, please consider upvoting it when you get enough rep! – Ed V Aug 25 '21 at 21:03
  • Or have your heroine chemist modify this stuff to remove the ‘pesky drawback’. ;-) – Ed V Aug 25 '21 at 21:06
  • @Maurice Acetylene is a little lighter than air and CO sneaks in just barely. And diborane. – Ed V Aug 25 '21 at 21:16
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    Ammonia and chlorine maybe? $\ce{NCl3}$ gives a good bang. Off-yellow color probably not a winner though.... – Todd Minehardt Aug 26 '21 at 00:19
  • Chlorine dioxide ($\ce{ClO2}$) is explosive at conc. above 10%. But the color is somewhat yellowish-green not quite you are looking for. Meanwhile, nitrosyl cyanide is blue-green but I'm not sure if it is flammable. – Nilay Ghosh Aug 26 '21 at 04:16
  • @EdV. Acetylene and $\ce{CO}$ have densities which are respectively $26/29 = 0.90$ and $28/29 = 0.96$ with respect to air. Instead of going upwards in the atmosphere, these gases will soon mix with air. And included in ballons, they will not float, due to the weight of the balloon. Anyway they are colorless. – Maurice Aug 26 '21 at 17:10
  • @Maurice Sure, but the OP said “Preferably lighter than air.” So lighter than air is not an absolute requirement. If it was, they would be out of luck. But they are doing fiction, so they can take liberties by using mixtures, etc. – Ed V Aug 26 '21 at 17:48
  • Since this is for a story, how about going with an aerogel containing explosive nano-encapsulated diborane and trifluoronitrosomethane and maybe some of the other chemical substances mentioned in the comments? Otherwise, there simply is no low molar mass gas that has color in the visible spectrum, i.e., 400 nm to 700 nm. Good luck with the story! – Ed V Aug 26 '21 at 20:39
  • @Todd You do not make NCl3, as it is a totally impractical high explosive no less. Dust, light, any organic, ...will cause it, for no apparent reason, to produce a huge explosion. Like playing with drops of nitroglycerine. As for ClO2, a light sensitive explosive and also toxic. Any idea of mixing chlorine and organics could easily produce a very toxic (immediate or slow) brew. – AJKOER Aug 29 '21 at 19:16

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Here is one possible embodiment for your story that is grounded in actual chemistry.

Warning dangerous explosive mixture is possible in reality, so as to mitigate potential danger, I recommend the use of only small amounts (say, a test tube) of hydrogen and chlorine gas in a well-ventilated setting.

The first step is to mix hydrogen and chlorine gas in a vessel. I would recommend for safety a deflated clear plastic bag devoid of any air/oxygen contamination.

Upon intended or accidental detonation, that can occur apparently via several paths, for example, per a reference, to quote:

The reaction of chlorine and hydrogen can be initiated by direct sunlight, other sources of ultraviolet light, static electricity, or sharp impact.

And produce primarily a shock wave with associated high temperatures and possible container shrapnel.

With all appropriate safety measures in place, expose the H2/Cl2 gas mix to a LED light consisting of UV light, or a spark. This results in a chain reaction cumulating in a very vigorous powerful explosion. Also, sunlight exposure may also result in unintended detonation in situations where there is a higher amount of reflective UV rays (as, for example, from a lake, ocean, snow,..).

Chlorine gas has some coloration against a white background. However, due to hydrogen dilution, likely less intense here, so close-up photography is likely required. Try increasing chlorine concentration to alleviate the coloration issue, as per a source, to quote:

mixture of hydrogen and chlorine is exploded by almost any form of energy (heat, sunlight, sparks etc). Explosive range: 5-95%.

Also, try dissolving the Cl2 in CCl4 (this may also help with the O2 contamination which stops the chain reaction).

See associated available videos here.

A novel last embodiment, yet to be verified (albeit, the associated chain reaction chemistry appears supportive of) is the reaction between chlorine (absence of any oxygen), hydrogen with added select metals imbued with hydrogen.

To construct the latter, for example, the insertion of Aluminum or Magnesium metal in HCl will, at least temporarily, possess an active surface presence of absorbed hydrogen (see this commentary by ScienceDirect and more extensive from De Gruyter).

As per a source already noted, various dry metal hydrides can ignite in chlorine, so this likely results in a detonation of the mixture. Additional caution should also be noted, as select metal hydrides, as powders, can even augment explosive powers.

AJKOER
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