1965 and 1968 Kennedy Half Dollar

[argento]

I was wondering if someone could offer their experties.

When I google information on the above two half dollars , they say there suppose to comprise of 40% silver.
Yet when I had them tested using two different XRF machines, they came up as being 80% silver.

They appear to be standard issue, but any help will be appreciated.

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[adze67]

They are silver clad over a copper core so the XRF would possibly pick up the external silver?
Wiki

19651970, some 17761976 San Francisco-minted coins: outer layer of 80% silver, 20% copper surrounding core of 79% copper, 21% silver, totaling 60% copper, 40% silver.

1964 was the first year of issue, at 90% silver, after that they went to 40%...
Parallels with our own '66 fiddy (both were 1/3oz ASW)? But all ours after that went to NO silver :/

 

[argento]

They are silver clad over a copper core so the XRF would possibly pick up the external silver?
Wiki

19651970, some 17761976 San Francisco-minted coins: outer layer of 80% silver, 20% copper surrounding core of 79% copper, 21% silver, totaling 60% copper, 40% silver.

1964 was the first year of issue, at 90% silver, after that they went to 40%...
Parallels with our own '66 fiddy (both were 1/3oz ASW)? But all ours after that went to NO silver :/

Thank you adze67
New I could rely on you guys.

Cheers Argento

 

[Jislizard]

OH, it's like that is it, I always imagined they were like a sandwich of silver/copper/silver.

 

[adze67]

OH, it's like that is it, I always imagined they were like a sandwich of silver/copper/silver.

Yeah, me too
But silver in the copper and copper in the silver :lol:

 

[Jislizard]

OH, it's like that is it, I always imagined they were like a sandwich of silver/copper/silver.

Yeah, me too
But silver in the copper and copper in the silver :lol:

I had hopes of being able to dissolve out the core and have the two faces of the coin separate, like they do when they dissolve out the zinc core of the post '82 USA pennies.

It does seem a very long winded way of doing it, rather than just having 40% all the way through.