Colored Gold ?

So I went down a weird rabbit hole the other day. Someone mentioned that video about purple gold... which just sounds fake, eh. Like something a sleaze ball tries to sell you in a back alley. But I looked it up... and it's real.
Sorta.
That got ya boy thinking, what other colors can you even make this stuff? If purple is on the table, what else?
First off, the basics. Gold is yellow. 24k, pure gold, that's its color. End of story. Anything else... white gold, rose gold, whatever... it's an alloy. That just means it's mixed with other metals. It ain't pure. It's "gold," but it's gold plus something else. Waht that something else is... that's the "secret."
The common ones ain't secrets at all. Jewelers been doing this forever.
Rose gold? Easy. You mix gold with copper. Copper's red. Gold's yellow. Mix 'em, you get reddish-yellow. Pink. Rose gold. The more copper, the redder it gets. Simple.
White gold? Same deal. You gotta bleach out that yellow. So you mix it with a "white" metal. Usually palladium, or sometimes nickel. Nickel is cheaper but a ton of people are allergic to it, so... palladium is the better play, but it costs more. It just washes out the yellow.
But that's the boring stuff. Purple gold... blue gold... black gold... that's where it gets weird.
That purple gold that started this whole thing... it's gold mixed with aluminum. But here's the catch, and it's a big one. It's not an alloy you can bend. You can't make a ring band out of it. It's called an "intermetallic compound." Fancy term, but it just means the two metals lock together in a crystal structure... and it becomes brittle as hell. Like, ceramic brittle. You drop it, it shatters.
So... it's useless, right?
Not useless, but you can't work it. You can't make a chain. So when you see purple gold, it's always an inlay. They basically treat it like a gemstone. They cut it, polish it, and then set it into a regular (yellow or white) gold band. So yeah, it's real... but it's basically a fragile gold-rock.
Blue gold is the same story. Gold plus indium or gallium. Makes another brittle intermetallic. Looks cool, but it's just for show. Just an inlay.
Black gold is usually a scam. Not always, but usually. Most "black gold" is just regular white gold with black rhodium plating. It's a coating. It looks mean, but it'll scratch off. Wears off over time. It's not black through-and-through. Sometimes they use lasers to oxidize the surface, or chemical treatments, but again... it's surface-level.
Green gold is kinda the OG alloy, they call it "electrum." It's just gold and silver. It even happens in nature. It's not like, bright green. It's a pale, yellowish-green.
So... yeah. You can make gold different colors. But it just makes me think... what's the point? It's jewelry. It's a novelty. When I'm thinking about stacking assets, I want the real deal. I want the 24k bar. The bullion. I don't want some brittle aluminum-gold-rock that I paid a 5x premium for becuase it's purple.
It's cool science... but it ain't money. It's the jewelry equivalent of some over-hyped NFT. It's just flash. Give me the base asset, the thing with actual utility and history. The rest is just noise.

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