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What IS that metal?

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paulca:
When you open an electrical product and it has an internal metal frame, it's often a yellow/golden looking material, often with what looks like temperature related rainbow bands of reds and even blues like Titainium.

Surely it can't be titanium?   It feels more like some form of aluminium alloy.

It's also commonly found securing transformers.

Anyone know what it is and why it's got the rainbowing?

Here is an example:
https://www.ebay.co.uk/itm/Dormeyer-DCT-20-120-Transformer-In-120VAC-Out-24VAC-20VA-w-Mounting-Bracket-/401521781402

jpanhalt:
That example is likely zinc-plated steel (galvanized).  It can show various colors depending on the process.

Alex Eisenhut:
It's the result of some sort of coating. eg

https://en.wikipedia.org/wiki/Chromate_conversion_coating

Monkeh:
That's just steel. The yellow is a chromated zinc plating.

RoGeorge:
Ideally that should be some magnetic shielding alloy, like Mu-metal, Permalloy or alike.
Not sure what metal is shown in the ebay pic, seen those colors often in vintage equipment.

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