Tip #28: Carbon is the frequency for diamonds. I use diamond powder used for faceting gemstones. Don?t know if it matters but I found some natural diamond powder. And BTW, diamonds hit hard with the frequency locator. You might think car tires would be a better target, but the diamond is so tightly formed it gives a strong signal. Many jewelers carry diamond powder. I think I found some on ebay. I would get a larger grit, but anything should work.
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