The Imperial Reserve Board says they're just as good as 100% silver denarii.
That's exactly the way the late Roman empire was inflating their currency.
They debased their gold coins by adding copper and their silver coins magically turned to copper.
Even so, it was hard to create enough inflation to pay their debts. Coining money is hard work and takes time.
We're much more efficient at creating inflation today. We don't even have to print money anymore. All we have to do is create an electronic entry.