Traffic Lights - A Science Demonstration

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Warn­ing! Sub­stances of this ex­per­i­ment are tox­ic and high­ly dan­ger­ous for your health. Do not try this at home.

When work­ing with sodi­um hy­drox­ide, wear rub­ber gloves and pro­tec­tive glass­es, as it caus­es burns if it gets on the skin or in the eyes. Only un­der pro­fes­sion­al su­per­vi­sion.