I think it's give native platinum silver value and get rid of "platinum-platinum" because it's beyond dwarven reach.
We can reach hell, balance the entire planet on a piece of soap, make walls out of a pebble, make giant screwpumps, and strangle elephants to death with our pinkie, but we cant get platinum? What.
Of course. Dwarves have neither advanced chemicals nor electricity, after all.
Again, advanced chemistry and electricity, ancient technology.
Batteries assumed to be used for electroplating were found among artifacts from ancient egypt, knocking both of those two things out right away. (Ancient Egypt, insofar as I recall, fell at some point before 1450).
While access to either thing was hardly something the layman had, like it is today, most technologies are, at least in principle, a lot older than we give them credit for.
Here's a short list of things that are hilariously old:
- Gunpowder: 9th century china
- Steam engine: 1st century greece
- Electricity: The basic idea that electricity was a "thing" was put forth around 2750 BCE, and animals who generated their own electric fields were used in pre-medicine.
There's no reason that a sufficiently ingenious race like the dwarves shouldn't be able to build guns, locomotives or power plants, or even HUGE, MECHANICAL SPIDERS! AHAHAHAHAHA!
Well, ok, maybe not the spiders.