DIY conductive gel
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✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.
Conductive gels are water-containing gels that also contain salt.
Fancier variants may be easier to clean up, and may deal with higher salt concentrations
...but for DIY needs, a fairly neutral or friendly gel (aloe vera seems a nice choice), and regular salt, seems fine.
The amount of salt should be enough, but isn't critical.