Dear Colleagues! I observed the following effect.
When Na2SO3 is heated strongly by any method (in a flame, in an electric arc, on a metal plate in an induction heater), the resulting residue should be a mixture of Na2SO4 and Na2S. (Indeed, when treated with water, the smell of hydrogen sulfide is heard, and with copper sulfate a black precipitate is formed). The hugely intense orange fluorescence of this residue in ultraviolet rays of 365 nm is interesting me - does ordinary sodium sulfide (which in current time is not available to me in its pure form, as I did experiments at my home, not in institution) have very strong fluorescent properties? Or, during the heating of sulfite, sodium polysulfides are also formed, even despite the oxidizing atmosphere? However, there is also no particular information about the intense fluorescence of alkali metal polysulfides.
The same fluorescence in UV appears after strong heating of thiosulfate, Na2S2O3, in ambient air (but at least it is known for certain that polysulfides of the Na2S5 type are formed in the residue).
Any such fluorescence disappears completely after treatment with water... even after the water evaporates.
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