Quickest way to tell if it is on a clad dime blank is look at the edge. If you see the typical "sandwich" appearance that you can see on any clad dime them it is on a clad planchet. If the edge is a solid silver color then it is either plated or on a silver dime planchet. For this the weight is the key. A plated copper cent will be very close to 3.11 grams,a silver dine planchet would be very close to 2.5 grams. Also if it is struck on a dime planchet it will be smaller than a cent and part of the rim and maybe even some of the design will be off the edge of the coin,