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<p>[QUOTE=&quot;Rory Roberts, post: 7893321, member: 124262&quot;]Hi Masterswimmer </p><p>Your feedback is very helpful, thank you. You are right that I have left many questions unanswered in my attempt to make a short video.</p><p>&nbsp;Let me try to address them here. A test of weight and dimension will establish the density of the coin, the measurement board will give the volume or dimension of a coin. And weighing a coin can be done with a sensitive scale of .001 gram sensitivity which are readily available on Amazon for about $25.</p><p>&nbsp;As gold is the seventh densest metal, this is a good start. Bad fakes have the wrong density. In order to counterfeit pure gold and still have the same density, the fake needs to be a mixture of a heavier and a lighter substance. Most of the metals that are more dense than gold can be ruled out such as plutonium and uranium, osmium, iridium. platinum is possible but is expensive. By a process of elimination we are left with tungsten, which is the same ( or very close) density as gold. </p><p><br /></p><p>The device is to validate coins and bars. The fake coin featured in the video is a thickly gold plated piece of tungsten. I have talked to many people and gold experts and placed the real coin and the fake coin in their hands, and they cannot tell them apart, they have the same density and they look and feel the same.</p><p><br /></p><p>&nbsp;To the swinging pendulum. The idea is that when testing the coin you log on to the website, which is still under development (. Oct 30th Launch). And Search for your coin. Say your coin is a 1989 Krugerrand, the number of readings you should expect from the genuine article will be listed there. If you do not get that reading you will know it’s a counterfeit. In this case a genuine American eagle 2008 will give you a reading of 60, so if you to test it and get a reading of 36, you would know it is fake coin. </p><p><br /></p><p>The pendulum works by testing the conductivity of the coin. Every coin has a distinct conductivity which relates to the composition of metals it contains. Any change in those metals will give a different conductivity measurement. A measurement of density and conductivity is enough to establish that any coin of any non - ferrous (not containing iron) metal is real. Any coin containing a ferrous metal is also fake and will stick to the base of the pendulum so is very simple to detect. </p><p><br /></p><p>In a little bit more detail ( and technicality), the pendulum motion is damped by the electromotive force given by the proximity of the conductive coin. “Faraday law of induction” </p><p><br /></p><p>The pendulum can test through slabs or any non conductive packaging. I believe after extensive research, that I found the best counterfeit on the market to demonstrate with, it is a tungsten core plated with over $100 of gold. Mixed with zinc,copper, tin to look exactly like the real thing. Any counterfeit that costs less than $200 will be relatively easy to detect. As the density will not be right, and the look and feel will not be right, it will costs at least this much to make a good replica, that can fool testing instruments. </p><p><br /></p><p>Your feedback is very helpful, I’ m going to take this on board and think out how I can get this across to the viewer more clearly.</p><p><br /></p><p>I will also include a demonstration of the measurement board. </p><p><br /></p><p>Answers to Your Questions directly: </p><p>1. It is designed to test bars and coins. </p><p>2. It is not designed to test jewelry, this is because the dimensions of the sample are important for the comparison. Technically you could compare one piece of jewelry to another if they were placed in exactly the same way under the pendulum. </p><p>3. Each gold or silver coin or other PM will have a different read corresponding to its exact composition and dimensions. This will be read from the online database. </p><p>4. Yes, the number of swings does equate to the purity of the coin, furthermore it relates to the exact composition of the coin, ie how much silver, and copper are in the coin aswell. </p><p>5. The counterfeit gold will also register different oscillations counts. We will have a database of counterfeits that can tell you the origin of your counterfeit, assuming we have encountered it before. 6. Silver is more conductive than gold, so typically the oscillation count will be smaller than gold for a silver coin. </p><p>7. Yes there will be a different count for different purities of silver. In general each authentic coin on the market, silver and gold will have its own count. The 1 Ounce pure coins will give readings that are close, they will only differ because of the dimensions of the coin. I am going to add a link to a repeatability test video below.</p><p><br /></p><p>Please feel free to bombard me with questions, this is exactly what I’m looking for. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p><br /></p><p>&nbsp;Thanks again Rory</p><p><br /></p><p>[MEDIA=youtube]ITSggwREXiI[/MEDIA][/QUOTE]</p><p><br /></p>

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