Gold from bagged Paydirt turns Grey?

[Butcher78]

I started getting bagged Paydirt back in 2019 - 2022.
I saved the bright yellow candy in a small glass vial and when I pulled it out today to see my saved gold it has turned grey in the bottle. Does anyone know why and how to bring back the shiny?

 

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[southfork]

I started getting bagged Paydirt back in 2019 - 2022.
I saved the bright yellow candy in a small glass vial and when I pulled it out today to see my saved gold it has turned grey in the bottle. Does anyone know why and how to bring back the shiny?

If it turned grey, it might not be Gold. A little Nitric acid would be a good test.

 

[Butcher78]

If it turned grey, it might not be Gold. A little Nitric acid would be a good test.

The profile pic is the B4 it went into the glass vial. The uploaded is now. I bought from 2 different company's. One based in Alaska and the other was from Arizona. The gold got mixed together but both changed color.

 

[pete61]

Might be mercury contamination, although I'd expect it to look a lot more silvery.
You could heat up a small section to see if it becomes gold colored again.
Look up cleaning mercury contam with a water retort on YT to see whats needed.