0.5g 9999 Gold bar

0.5g pure 99,99% Gold bar
can be used as gold electrodes for colloidal gold.
see film how to use them.
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Consider to buy the pressed gold bars. They have 4x bigger surface and produce about 2x faster.
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price for one piece
normally you need 2 for electrolysis.
If you take 2-4, they are in one piece you can break up yourselve.