I got *really* hyperfixated in 2019-2020 on the idea of making my own NV diamond magnetometer. I was sooo close to pulling the trigger on it, but the chemical supplier company I tried buying NV nanodiamonds from insisted I needed certification/documentation of proper chemical storage, despite the fact that nanodiamonds are biologically inert and harmless.
How's a person supposed to mad science with all this silly safety red tape? lol