There seems to be a lot of confusion around regarding what trumpet bells are actually made of and what difference this makes to the musical qualities of the instrument. Confusing terminologies abound but from what I've read, all 'normal-ish' materials fall somewhere within the following sequence (roughly in order of increasing 'strength')
Low zinc brasses (<16% Zn)
High zinc brasses (>24% Zn)
My impression (not understanding) is that this trend equates approximately to dark and flugelly at the top to bright and trumpetty at the bottom.
Clearly, other factors are in play. I've read that thinning the material drives it down the scale (eg can make a silver bell sound bright) as does work-hardening, while annealing tends to send it in the other direction. Bell shape, yet another issue entirely.
Do I have this approximately correct?