yeah, see, that’s what I was talking about. Simply picking individual wavelengths and calling it a day is unfortunately nonsense. You gotta actually do the spectral math and convert to the correct color.
You most likely want the bulk version (i.e. a chunk of gold). Thin film may look quite different.
Also, unless you want really hot gold, perhaps use the gold at 25°C for some room temperature gold lol
The differences are probably small, but still, why would you use the version baking in an oven?