Experimental demonstration of electrocoagulation creating a traffic-light effect with pH indicators, implying fun applications in visual displays.
A five-minute experiment that couples electrocoagulation with local electrochemically induced pH changes produces a red-to-green-to-red-to-green color change (i.e., a traffic-light effect). The readily available pH indicators methyl red and bromocresol green give such an effect.
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Santoyo-Cázares et al. (2006) studied this question.
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