schmidtyss
New Member
i have a 1961 penny with what looks to be toning but im not sure ...i got it from a mixed roll of 50's-60's pennies
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is this toning at all?
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schmidtyss
New Member
well as you can tell by the back the colors go from purple to light blue and green ish colors ...its more pronounced in some angles as opposed to others so yes. ill try one with my 8x lupe but its hard to get it just right
Here is a photo of a rainbow toned 2 Corona coin and another coin with no toning.
The copper penny looks like it's been annealled by heat, and the silver coin shows toning (sulphidisation).
Both produce an (oxide or equivalent) layer on the original metal that is so thin it's transparent and disrupts the reflected light.
http://mrtitanium.com/interference.html
Different oxide layers produce differnt refraction and therefore colours until the thickness gets too great to allow light to be reflected (i.e. black toning).
Most metals are subject to this phenomenon.
Spyderco have been exploiting titanium's ability to be altered as a sales gimick for a number of years..
Both produce an (oxide or equivalent) layer on the original metal that is so thin it's transparent and disrupts the reflected light.
http://mrtitanium.com/interference.html
Different oxide layers produce differnt refraction and therefore colours until the thickness gets too great to allow light to be reflected (i.e. black toning).
Most metals are subject to this phenomenon.
Spyderco have been exploiting titanium's ability to be altered as a sales gimick for a number of years..
Get shanked in style :/
Brass
Niobium
Steel
Niobium
Steel
schmidtyss
New Member
son of a....grrr all i want is one nicely toned coin and i thought i lucked out .....back to looking for toned eagles