Ferro audio-visualizer - GIF

Ferro audio-visualizer with sound-reactive ferrofluid.

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Previously:

https://www.homemadetools.net/forum/...2050#post75646
https://www.homemadetools.net/forum/...4677#post80364

There's a nice big electromagnet behind that flask. Probably two different oils. Mineral oil and ferrofluid also an oil suspension. I generally get that stuff put into tweeters when I am producing them. Good at absorbing unwanted vibrations. Acts a little like a shock absorber.