The Electra uses Berea's "Upgrade Gold". The following quote comes from Berea's site. I hope they have no objection to me posting it here, if they do, I will remove it:
All gold plating we use on our kits is 24K "upgrade gold". Upgrade means that the parts are plated using the rack method and that small amounts of cobalt or palladium are added to the plating chemicals. This enhances the durability of the gold plating. The tumbled method, which we do not use, produces an inferior gold plating and is less costly.
Berea does give us the flexibility to have kits "custom plated" in TiGold, if we wish. The cost would probably be at least 50% higher than the upgrade gold. How much interest would there be in the Electra in TiGold?