A couple of weeks ago, I had an occasion to dig out my flask of sodium acetate I'd made a few years ago (I wanted to see if I could make it from scratch and get it to crystallize properly). If you're not familiar with it, sodium acetate is the chemical in "phase change" heating pads - the ones that have a clear liquid inside, and that solidify and release heat when you "click" a little metal disc in the corner of the pad; they are "recharged" by boiling the pad until the white solid inside becomes liquid again.
I'd made an Instructable about it - it's amusing to read. It was an interesting diversion, though I was a little concerned about having a neighbor see all of the glassware in my kitchen through the window and report me to the police, suspecting I was running a meth lab.
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