In India, during Diwali -- the festival of LIGHTS all kinds of firecrackers are sold. It's during this time that the BLACK SNAKE tablets are readily available. As you light each tablet with a burning matchstick the tablet burns with a lot of smoke and leaves behind a black tubular ashy structure looking like a snake. The tablet is a mixture of Sodium bicarbonate (which produces the Carbon dioxide) and the foam, Sugar -- which provides the Carbon and some explosive material. On burning the material expl
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