pH indicators are used to visually detect variations in acidity/basicity via changing color. In this case, two indicators (bromothymol and phenolphthalein) are combined in a solution of isopropanol and ethanol. When a chunk of sodium is introduced, it reacts with the alcohol mixture to form an alkaline environment and therefore produces a color change. However, because isopropanol has a high viscosity, the propagation is very slow, which results in the flower-like distribution of color around the sodium.
Source: https://youtu.be/RQzFPQ5sy-w
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