Canada Silver Proof

1963 Canada Silver Dollar, PCGS Proof Like MS 66 Trueview- Rainbow Toned

1963 Canada Silver Dollar, PCGS Proof Like MS 66 Trueview- Rainbow Toned
1963 Canada Silver Dollar, PCGS Proof Like MS 66 Trueview- Rainbow Toned
1963 Canada Silver Dollar, PCGS Proof Like MS 66 Trueview- Rainbow Toned
1963 Canada Silver Dollar, PCGS Proof Like MS 66 Trueview- Rainbow Toned
1963 Canada Silver Dollar, PCGS Proof Like MS 66 Trueview- Rainbow Toned

1963 Canada Silver Dollar, PCGS Proof Like MS 66 Trueview- Rainbow Toned

I have had this coin for 20 + years. Untouched, it has developed a natural tarnish that has evolved to a multi - colored.

NO Colored Lights were used in the photos. The PGCS Trueview photo is accurately shown. The incredible reflected colors range from Deep ultra-violet Blue through the rainbow to Orange - Red. Curious, I did some research: First, volcanic eruptions blow sulfides into the the atmosphere.

Then clean (in this recently minted, silver) is exposed and a slow reaction occurs, and deepens in thickness with time, as explained. Figure 2: As light hits the silver sulfide tarnish layer, some of it reflects off the top surface, and some of it passes through and then reflects off the underlying silver layer. These two different paths for the light result in light interference and produce different colours on the silver surface, depending on the thickness of the silver sulfide tarnish layer. When the light from the top and the bottom of the tarnish recombines, some of the colours are lost through interference. The colour that remains depends on the thickness of the tarnish layer.

In the early stages of tarnishing, as the thickness grows from 10 to 100 nanometres (nm), the colour changes from yellow through red-brown to blue. For thicknesses greater than about 100 nm, the colour is black, the true colour of silver sulfide (Selwyn 2004). This is due to a phenomenon called thin film interference. As light hits the thin film of tarnish on the silver, it splits; some of it reflects off the top surface, and some of it reflects off the silver under the tarnish.


1963 Canada Silver Dollar, PCGS Proof Like MS 66 Trueview- Rainbow Toned