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When using the metal base type, using preset custom selecting a metal ior seems partially broken .Selecting copper, gold etc do nothing to the mxm.
Aluminuim and chromium seem to be having an effect so on face value it looks like some are missing there links to ior files /mxm's.

Or is it user error on my part expecting selecting gold to change the colour?

that happened since the the first release of v3
the color of the metal don't change; only nd an k changed ;
but you can create your own preset in Metal.xpr

Preset "24K Jewelry Gold"
{
"IOR" = 5;
"Tint" = 0;
"Color Type" = 0;
"Color" = 206,90,7;
"Roughness Type" = 0;
"Roughness" = 0;
"Anisotropy Type" = 0;
"Anisotropy" = 0;
"Angle Type" = 0;
"Angle" = 0;
"Dust Type" = 0;
"Dust" = 0;

choose ior from : 0 to 10 for your preset and choose the right color of the metal you want
"Aluminium", 0
"Chromium", 1
"Cobalt", 2
"Copper", 3
"Germanium", 4
"Gold", 5
"Iron", 6
"Nickel", 7
"Silver", 8
"Titanium", 9
"Vanadium"; 10

thought I'd bring it up as we are at 3.1
metal xpr ? whats that Seghier

in maxwell3/extensions/presets : Metal.xpr
save copy of it and than add any preset you need

thought the whole point of the MX_metal_IOR aspect was that it was pointing to a complex ior file ?

cheers for the other info btw

no ; the ior is defined in other file called : Metal.xui
and you are free to create any preset
for use complex ior you need convert metal to advanced ; i don't know if it is possible to add complex ior to Metal.xui

I do fail to see the logic of them then tbh. They are just the same as the metal presets , in a different menu but without colour values . We could have just had them in the same menu as the other metal presets and drain them of saturation in the colour picker if that was what we were after. They would have been of more use as at least then they would have colour values if needed.

I'm sure some bright spark will explain what I'm not grasping just yet.

preset are only examples of metal ( like in grass presets )
you see when you change one preset the metal ior changed ; so for copper ior you need to create copper preset and the same for other metals
i created this preset in the v 3.0.1.3

Preset "Copper"
{
"IOR" = 3;
"Tint" = 0;
"Color Type" = 0;
"Color" = 243,134,79;
"Roughness Type" = 0;
"Roughness" = 0;
"Anisotropy Type" = 0;
"Anisotropy" = 0;
"Angle Type" = 0;
"Angle" = 0;
"Dust Type" = 0;
"Dust" = 0;
}

when you choose it the metal ior changed automaticly to copper ( ior = 3)
colors changed in presets not in metal ior

I suppose what I'm saying Seghier , is that its the same list thats in v2 metal wizard . Apart from in v2 they come with colour values which made them useful . As it stands at the moment I'm better of exporting some metal mxm's from the v2 material editor to use in v3 for quick versions of copper gold etc.

i think maxwell team can make it better to get the right color
and is useful if they add ior measured data under metal ior to choose ior from list ( like in light presets )
and adding button to save new preset when creating it without need to open text editor and create presets manually