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Take all the "beans" fill up 100ml of water, drop them in, measure how much the water level increased, let's say it increased to 103ml so that's +3ml.
Next, weight the "beans". Let's say they weight in at 50 gram then you can be certain It's a high % gold.
Gold density is 19,3 so 1ml of pure gold should weight in at 19,3 gram.
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