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<p>[QUOTE=&quot;gatzdon, post: 280233, member: 8247&quot;]Don&#039;t know how easy it would be for OP to make up slugs of copper nickel, but the materials are readily available (nickels, pennies, older canadian nickels, etc...)</p><p><br /></p><p>The anticounterfeiting experiment with vending machines is college level, but partially solved 40 years ago.</p><p><br /></p><p>The solution was to generate bimetal laminated coins whose electromagnetic signature is not easily duplicated.&nbsp;&nbsp; A slug with exact same copper-nickel composition (but homogenous) would not fool a vending machine.&nbsp; One can buy electronic coin validator&#039;s for less than $100 brand new (I&#039;m assuming used would be cheaper).&nbsp; The hands on part would be showing that a coin validator that accepts the legitamit bi-metal coin, but still rejects the slug despite it having the exact same amount of copper/nickel.</p><p><br /></p><p>There are token manufacturers that have taken the anti-counterfeiting measures to greater levels, but their technology is primarily used in more expensive tokens like $5 car wash tokens.[/QUOTE]</p><p><br /></p>

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