How Does Aqua Regia Dissolve Gold and Platinum?

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Clips from old videos featured in this one:

Gold Chemical Resistance
https://youtu.be/ng6DGwiKWag

Platinum Chemical Resistance
https://youtu.be/fro-L5gSyh4

Platinum bar dissolving in Aqua Regia
https://youtu.be/APxL87X92t4

Dissolve Platinum with chlorine gas
https://youtu.be/JFNtP2N2Eho

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