It's even the constructed floor and the bar in the stockpile which look like iron, even though the divine material looks like it
should use a color token.
And while a lot of the found divine artifacts are subvariants with modifiers like 'crescent', 'curvy' etc. and thus lack a proper sprite, normal weapons and armor have a sprite, but it's colored like iron and not according to the color tokes of the procedurally generated divine metals in 'world.sav'.
While the two divine metals I found that I could smelt had somewhat unexpected color tokens, I found artifacts made of 'crashing metal', 'clear blue' metal and 'black metal' which by world.sav should have different color tokes, but are equally displayed as made from iron.
Maybe this is an outright bug?
Well, I still don't understand why iron and steel use the same color tokens but render slightly differently in color in game. I will experiment futher to see if I can swap color of copper and silver.
EDIT:
Swapping the [STATE_COLOR:ALL_SOLID:COPPER] and [STATE_COLOR:ALL_SOLID:SILVER] in inorganic_metal.txt did the trick for common items like bars and bins: My copper bins are now rendered silver. That's interesting, because I did not modifiy the [DISPLAY_COLOR] and [BUILD_COLOR] at all.
However, the [STATE_COLOR] for the divine metals in question is already WHITE and BLACK respectively, but the items are rendered as GREY like iron. But at least this explains while iron and steel are rendered slighly different ingame: steel is [BLUE-GRAY] while iron is [GREY].
And while I was able to make steel black by just changing
[STATE_COLOR:ALL_SOLID:BLUE-GRAY] to
[STATE_COLOR:ALL_SOLID:BLACK]
in 'inorganic_metal.txt', which renders constructed doors, cabinets and armor in the inventory black as expected, it does NOT for the military dwarves wearing steel armor:
That's unexpected again..
[/EDIT]