How to quickly tell the difference between a clad and silver proof state quarter?

Am I correct that the only way to quickly determine if a state quarter proof is silver or clad is to examine the edge to see if the core is copper or not?
Thanks.
Thanks.
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<< <i>Lay a tissue over a clad coin and a silver coin, the silver coin shows through the tissue as white, the clad coin isnt visible much at all. Quick and easy..... >>
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<< <i>Silver also has a nice ring to it when dropped as opposed to a clunk. >>
They sound the same to me.
...do I have to take them out of the 2x2s first?
New collectors, please educate yourself before spending money on coins; there are people who believe that using numismatic knowledge to rip the naïve is what this hobby is all about.
it's not expressly stated in the law, but the law requires the coin sets to be made in proof and silver. There is an implication the coins stay the same. They could make them at WP and that would comply if they used a W mint mark.