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What are the grades of these boards? The motherboard has a soldered CPU and is a 1996 Apple board. I figured someone would find the HDD platters interesting.

Thank you!

Large socket.

Both peripheral. Remove the black clock box

Gold finger card. Here with heatsink/fan.

NICE shot! Almost future retro in style.
Platters have their own class.

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The way I colored my HDD platters was heating them up in a fire enough to make them change color( but not melt, one did a little bit). Just like when you heat up steel to make it change color which is around 500 to 600 degrees Fahrenheit. Palladium does this around 600 degrees Fahrenheit. But not all platters will do this, only certain ones will.

When you find the actual gold platters from the 5.25” drives you can make some really weird colours.
I have a heat gun that goes to 2100• so we used to play with them with a friend who had a shop and he’d mount them in frames on his wall.
I did a set of 22” platters from a disk pack for him to make ceiling hangers.

Finding toning was an accident. He was initially interested in finding what temperature disk platters failed at for old mainframe data servers. (14XX•F btw).
For those looking for another data destruction method that is more dangerous than a magnet and actually works... heat gun at 1600• makes a modern platter generally unrecoverable.

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I have several old 5.25 hard drives, with odd colored disc, how can I tell if they are gold

While most 5.25 platters are brown gold platters will have an orangish tint to it, or yellow orange.
The only way to be sure is to use a gold acid test.
They’re not any sort of major value difference in scrap price, the micro layer is about the same as other materials.
But heating them up is fun. Very strange colours!

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thanks so much, I will use my torch tomorrow.