So, a long time when I was little and fiddling with the ol baking soda - vinegar reaction, I had placed some baking soda, toilet paper, and vinegar into one bowl/dish and let it react and get the toilet paper all wet. Then (for an unknown reason) I electrocuted it with a 9V battery, sticking two leads into the wet paper separated by a thin section of the paper. The water (with a dilute of sodium acetate according to the results of the reaction) sizzles a bit and then the paper turns blue. Darker blue the longer I hold the leads there. So, my question is, why does it turn blue?