How to make your own ferrofluid, microwave furnace, ferrite rods and PCB etch

How to make your own ferrofluid, microwave furnace, ferrite rods and PCB etch
  Robert Murray-Smith
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I loved this experiment and it is a fine example of how curious the world is and how much can be done with jam jars and drain cleaner. So what you will need: Hydrochloric acid - sold as spirit of salts from a hardware store Household ammonia - hardware s

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