A familiar reaction, but this time it is a bit new:

the essence of the reaction is the reaction of sodium and water to produce sodium hydroxide and hydrogen, which I believe everyone is already familiar with. The effect of "dancing" comes from a double-layer liquid, with kerosene at the top and water at the bottom. The small lump of sodium does not react with kerosene (it can also be stored in kerosene). It sinks in kerosene and begins to react after it comes into contact with the lower layer of water. after the bubble, the bubble will push it to the upper layer, and then, continue the process of sinking-reaction-floating-sinking again.

as for the colors in the water layer, they come from acid-base indicators, which show color when they encounter the resulting base. The pink one on the left is the familiar phenolphthalein, and the blue one is thymol phthalein.

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this version looks better, but it should be pointed out that generally speaking, the measuring cylinder is not a suitable reaction container.

Source: Thoisoi2-ChemicalExperiments!