Canadian 1967 Silver content?

I know that some 1967 Canadian Quarters are 80% and some are 50%, is there a way to tell which is which?

I have 27 of the 1867-1967 Bobcat centennial quarters, I assumed that they are all 50% silver, but some are 80% I have read.

Thanks in advance!

 

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acoording to my charlton 2009 no there is no way to tell the difference between the .5 and .8 varieties from appearance.

that said I might make the assumtion that the weights could be different but i'm not 100% on that

 

Thanks. I know you can't tell from appearance, I was wondering if there might be a weight difference.

 

does the tissue paper method work on these? Put a piece of tissue paper over them and the darker appearing ones may be the 50%ers