Copied from another thread: hafnium film can be applied to glass...

Copied from another thread:

hafnium film can be applied to glass and have the impact of working as an “energy free” air-conditioner by reflecting the radiation from the sun from buildings without compounding the greenhouse effect when it reflects back into the atmosphere. Early days but an interesting development.
Hafnium metal price has moved from a couple of hundred dollars a kilogram to around $1,000/kg currently. We don’t anticipate producing metal, this is a very specialised field, but probably hafnium oxide which, though it sells at a lower price will still be capable of adding substantial revenue."
This sounds like they are looking at hafnium with a lot more intensity than I thought. Still, I expect them to add such a circuit only once the DZP is already up and running. OTH, if Boeing etc are really interested in a reliable hafnium source, they might be willing to chip in with financing the DZP ...