I've used that bronze mix on a couple projects. It's the Scale75 metallics. I start with Necro Gold and mix that 50/50 with purple (Reaper's Imperial Purple, though any dark-ish purple will do). Into that I start to slowly mix Elven Gold. When I get up to roughly 60/40 Elven Gold to Necro/Purple mix I stop and start to mix in Thrash Metal from Scale75's silver set to create the top lights. I use pure Thrash Metal for edge highlights and to pick out details.
The point where I stop with the Elven Gold and start to add Thrash Metal is not an exact ratio. I want it to be a decent amount lighter than the shadow tone, but I stop before it gets too yellow. If I went up to pure Elven Gold first, those midtones would be much yellower and it'd have more of a gold feel. It's the same reason I use Thrash Metal for the highlights instead of the Citrine Alchemy that comes in the gold set.
