Are you talking about the rings and the ingots?
They are indeed 3 different colors. And they are made out of a single mithril + Valinor Gold and Silver and Steel alloy.
I said I'm willing to accept it as movie magic, and that's in the context that the show doesn't give a fuck about realism. Just like I can accept Legolas surfing down stairs while firing off arrows is movie magic in the context of not caring about realism for the sake of being cool. It doesn't make it free of criticism or absolve it of being nonsensical. Just like I can accept that children in a playground are going to scream even if you tell them not to, it doesn't make it okay that children are screaming. It's merely acceptable, not free of being problematic.
If your answer to this is 'Well it's just a mistake, like the Starbucks cup in GoT' then I'm literally explaining to you that no, this is a full sequence of many multiple shots that has multiple continuity errors within it, and that is not equatable to a single sequence that has a cup in the shot that they forgot to remove in post production.
The nature of the mistake is not the same. And it's acceptable in the context that this show and the audience it's made for doesn't really give a fuck about the details. These issues really only exist in the enthusiasts like the few on this board who care enough about the details to point out the inaccuracies.
Then you're implying headcanon that somehow the single dagger they put into the forge and came out with a single pool of metal somehow yields different ratios of gold/silver/steel/Mithril within it to make 3 different colored ingots. That doesn't make sense even when you explain it like this. The entire explanation they gave for having this single alloy is because they needed to coax the metals together rather than forcing it and that they don't have time to experiment on many different alloys. And they literally show them not even taking the time to separate the metals of the dagger before smelting. So whatever explanation you're trying to give me is nothing more than your headcanon, because the show literally shows the single dagger being melted as one pool of metal, with the full chunk of mithril tossed in.The steel could have been important to the final product just as much as the purity of the gold and silver. We also don't know if the blade was 100% steel, right? One pool of metal can have a different ratio if not mixed fully. We also don't know what impact a magical metal will have. So you can't call it a mistake. Arondir's buzzcut isn't magical either. You really do have a grudge against the character huh? Manually clippers exist.
Like, in what world does your explanation make more sense than merely brushing this off as movie magic? At least by saying it's movie magic, I literally accept the inaccuracies being presented. If you're trying to realistically explain the inaccuracies as being plausible, then your explanation is unrealistic. Kinda like if I said a James Bond villain firing rifle shots into the water to try and kill someone is unrealistic because the bullets lose momentum in water, but I can accept it as 'movie magic'. And then you come in and try to explain that because the villain could be using a higher-powered rifle that makes it realistically plausible, I'd say no it still wouldn't be because that's not how physics work and the explanation is just as stupid in the context of how the movie portrays bullets in water. Any rifle capable of firing bullets that streak through the water as shown in movies would be powerful enough to take the arm off the person wielding the gun. You can't try and explain away movie magic with some plausible realistic explanation when it isn't realistic to begin with.
It's not a mistake that they have three different colored ingots crafted from one pool of metal. It is an unrealistic, inaccurate portrayal of mettalurgy and how alloys are created (in real life). It is an intentionally unrealistic portrayal for film, one that doesn't need explanation, but can still be pointed out as being unrealistic and inaccurate to real life.2 silver ingots and 1 gold ingot can be called the same as a starbucks cup or fingers still existing on a hand after being cut off. Because it is a simple error of color. If the ingots were clearly 2 gold and 1 silver then it wouldn't be an issue. It is like you are purposefully being obtuse here when you already agreed with me on what was the goof in an earlier post. Why ignore that just to keep whining about stuff now?
The ratio explanation just doesn't work at all, because we're literally shown the dagger melting in full in one go. It's not like they melted it in parts and merely implied that they had three separate alloys with different ratios for each. You're attempting to explain something that doesn't need to be explained, and I'm pointing out why there's no reason for you to even go to these lengths. You have no reason to try to explain it as though it could ever make sense realistically. It can't. That you personally think it is because of different ratios comes from your own choice to imply headcanon to make sense of things that don't make sense. It doesn't actually work the way you think it does in real life, just like bullets in water don't travel further just because you might have an alternative explanation in mind that would make it work.