So... back in the day we accidentally switched the Electrum and Radium pigments when we made our first batches. Consequently, the name doesn't match the color anymore, but it's been far too long to change them back, so here we are.
Electrum exhibits a subtle color shift between green, gold, and a hint of warm something or other on the finish. It is always changing and doesn't have an either/or kind of look.
Note: Electrum must be used over a black basecoat. If used over white, it appears reddish-orange.