Asklemmy

Holy shit fours on blue AND yellow, AND it's an oxidizer? My guess is some kind of halogenation agent, likely fluorine based. The lack of flammability with those stats makes me think it's an inorganic compound, probably some wretched fluorine abomination.

https://www.science.org/content/blog-post/things-i-won-t-work-dioxygen-difluoride

Probably related to this, very fun column to read.

Chlorine trifluoride! Nasty, NASTY shit. Guess which industry I worked in as safety!

Edit: I remembered this quote about ClF~3~ from John D. Clark's book "Ignition!" and wanted to share. For the non-scientists, hypergolic means it'll ignite on contact with another substance without an outside energy source, like a spark.

It is, of course, extremely toxic, but that’s the least of the problem. It is hypergolic with every known fuel, and so rapidly hypergolic that no ignition delay has ever been measured. It is also hypergolic with such things as cloth, wood, and test engineers, not to mention asbestos, sand, and water-with which it reacts explosively. It can be kept in some of the ordinary structural metals-steel, copper, aluminium, etc.-because of the formation of a thin film of insoluble metal fluoride which protects the bulk of the metal, just as the invisible coat of oxide on aluminium keeps it from burning up in the atmosphere. If, however, this coat is melted or scrubbed off, and has no chance to reform, the operator is confronted with the problem of coping with a metal-fluorine fire. For dealing with this situation, I have always recommended a good pair of running shoes.

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If I'm to understand [email protected] correctly, it's something that's:

Extremely hazardous,
non flamable, Extremely unstable, Reactive to water

And if ox means oxidising, reacts to exposure to oxigen.

I thought Lithium, but that catches fire and this is non-flammable.

I haven't a clue what this could be, but now I'm curious.