Thank you /u/socat2me . We are grateful to you for conducting this test of our bromazolam powder and sharing the results with everyone. I hope to deal with you again in the future, we have lots more bromazolam available.
This is most likely because at temperatures that high the the molecule starts to break down. So even upon cooling you're left with an irreversible reaction.
When I allowed it to cool back to a solid it also was also a red color. Coloration in minerals and molecules can be caused be impurities present in quantities as little as something on the order of 1E-6%, but don't quote me, it's just a very low number.
They're also caused by systems that have heavily de-localized networks of bonds that electrons can sort of simultaneously exist throughout the whole system rather than their probability density fields being found in a certain area. These are called aromatic and conjugated systems. They can absorb EMFs from various wavelengths and then re-emit it within the spectrum of EMFs that contains visible color, hence they of course appear colored,
Bromazolam may undergo such a transformation when it reaches it's melting point and decomposes to the new molecule, though I haven't done enough research to know what that new molecule's identity is.