Tellurium Chemistry: Two flame colors of Tellurium [hard to see]

If Te compounds are burned the flame color is said to be a mix of green and blue and if the right temperatures are chosen a green flame can be seen in the colder part of the burner while a blue flame shows in the hot parts. It seems to be due to an oxidation taking place. Not only is the Te ionized when heated in a hot flame but also oxidized by the air at the elevated temperature. The green flame is supposed to be the oxidation to Te(IV) while the blue flame is the oxidation to Te(VI).
There is another element in the PSE that changes color depending on the temperature of the flame and that is Thulium...which we unfortunately don't have at the moment. But we will order some, soon and try that.

What you can see here is us holding a bit of Te at the very end of the flame of a burner then moving it closer to the core of the flame. At first the flame really seems to be slightly greenish. The cam doesn't pick it up well but it was way greener than the core flame which is blue. Maybe someone can try this with a better cam again.

Also if you find more information on this reaction we would be happy to get some additional information on this as it was hard to find anything on this phenomenon.