Once when I was doing a experiment I have this experience, my ring was decolourised. I was afraid first but we can reverse it to the gold again.

There is no reaction between gold and $\ce{Hg}$ and it is type of mixture such that $\ce{NaCl}$ is soluble in water. When the gold and $\ce{Hg}$ mixed they make a amalgam, and this thing is call as amalgamation. It also uses to allocate pure gold by colluvies.

Before I said that there is no reaction between gold and mercury, therefore there is an easy way to allocate gold again. You know that boiling point of gold is more than mercury($\ce{Hg}$: $\pu{356.7 ^\circ C}$ and $\ce{Au}$: $\pu{2700 ^\circ C}$) Therefore when you heat the amalgam the $\ce{Hg}$ will boil and the gold will balance. But don't do this in the house, give it to a professional gold maker or a gold shop (After I experience this, I went to a gold shop and they heat my ring and it became such like before).

Once when I was doing an experiment I had the same experience; my ring was decolourised. I was afraid at first but we could reverse this process to achieve the gold colour once again.

There is no reaction between $\ce{Au}$ and $\ce{Hg}$; they form a mixture similar to dissolving $\ce{NaCl}$ in water. When the gold and mercury are mixed they make an amalgam (this process is called amalgamation). It is also used to allocate pure gold by colluvies.

Before I said that there is no reaction between gold and mercury, therefore there is an easy way to allocate the gold again. We know that the boiling point of gold is higher than that of mercury  ($\ce{Hg}$: $\pu{356.7 ^\circ C}$ and $\ce{Au}$: $\pu{2700 ^\circ C}$). Therefore when you heat the amalgam the mercury will boil off and the gold surface will be restored. But don't do this in the house, give it to a professional goldsmith. (After my experience, I went to a gold shop, they heated my ring, and it became just like it was before.)

Once when I was doing a experiment I have this experience, my ring was decolourised. I was afraid first but we can reverse it to the gold again.

There is no reaction between gold and Hg and it is type of mixture such that NaCl is soluble in water. When the gold and Hg mixed they make a amalgam, and this thing is call as amalgamation.It also uses to allocate pure gold by colluvies.

Before I said that there is no reaction between gold and mercury, therefore there is an easy way to allocate gold again. You know that boiling point of gold is more than mercury(Hg-356.7C and Au-2700C) Therefore when you heat the amalgam the Hg will boil and the gold will balance. But don't don't do this in the house, give it to a professional gold maker or a gold shop.(After I experience this, I went to a gold shop and they heat my ring and it became such like before).

Once when I was doing a experiment I have this experience, my ring was decolourised. I was afraid first but we can reverse it to the gold again.

There is no reaction between gold and $\ce{Hg}$ and it is type of mixture such that $\ce{NaCl}$ is soluble in water. When the gold and $\ce{Hg}$ mixed they make a amalgam, and this thing is call as amalgamation. It also uses to allocate pure gold by colluvies.

Before I said that there is no reaction between gold and mercury, therefore there is an easy way to allocate gold again. You know that boiling point of gold is more than mercury($\ce{Hg}$: $\pu{356.7 ^\circ C}$ and $\ce{Au}$: $\pu{2700 ^\circ C}$) Therefore when you heat the amalgam the $\ce{Hg}$ will boil and the gold will balance. But don't do this in the house, give it to a professional gold maker or a gold shop  (After I experience this, I went to a gold shop and they heat my ring and it became such like before).