A lot of it was probably sugars from the vinegar decomposing and caramelizing. You could do a titration to see how much by weight is actually sodium
acetate. One cool thing is that you probably generated some carbon nano particles, mainly graphene quantum dots. They can be formed from the thermal
decomposition of things like sugars and citric acid. When purified they fluoresce nicely but the purification usually involves a membrane or dialysis.
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