The situation, briefly, is that I'm doing science in a Faraday cage, but have a lot of electrical noise that just randomly started at some point. It happened before, and went away within a week or two, but recently it started again and after a few days I got fed up and started removing things from the cage. It turns out that the bifurcating gooseneck light that I use to illuminate the preparation is causing it. I don't know why that suddenly started, or what. I just got frustrated with removing it to make a recording and grounded both necks, and it's... much better, maybe even usable.
However, it's still somehow generating noise. I know this because when I touch it, the noise decreases even more, but springs back about a second after I let go. I don't think it's just me being grounded (it might be? Not an expert) because when I dip my finger into the grounded solution the prep is in, there is still noise.
Does anyone have experience with this, or ideas on how to fix it?