Collapse of Central Banks and fiat system you say? Cool 😎
(media.communities.win)
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Just saying - there are more colors there than the number of precious metals ... :)
2 pieces there are silver the rest are:
2 18k
2 10k
8 14k
1 23k
10k being ~42% gold means 58% are other metals. Usually copper, nickel, or silver. More copper = more red hue (like rose gold)
14k is ~58% gold so 42% other metals
18k is 75% gold, so 25% other metals.
So depending on the alloy composition you will get different hues, especially with lower gold content.
Lots of fake gold out there though, I use nitric acid on all of mine as a preliminary, plus gold is dense so the feel, look, etc all come into play.