Post by Gregory Sullivan
I'm looking for a chemical that reduces the burn temperature of stars.
You mean that reduces the temperature needed to sustain their burning? Or that acts as a heat sink to lower the temperature of the compo on fire?
A lot of things can do the latter -- water for one. If part of the composition comes with waters of hydration, or is just damp in some quasi-stable way until the star is ignited, the heat of vaporiz'n of that water gets taken away.
For the former, you need a catalyst. Sulfur is said to act in part catalytically in many star redox rxns. It's not your classic catalyst in that it takes more than a tiny pinch, & it does get consumed itself, but it's what makes BP easier to catch & faster burning than just a charcoal-KNO3 mixture, & similarly w both perchlorate & chlorate compos.
S can act in the former capacity too, because if it's used in stoichiometric excess it needs heat to sublimate it. So S is said to deepen some flame colors by shifting the burn temperature to one where certain emission lines dominate more.