Fluorescein is an orange powder. But when added to water, it forms a bright green solution, which glows under UV light.Despite its name, it contains only carbon, hydrogen and oxygen, and can be safely used as a dye or marker. It is also used in medicine,

Fluorescein is an orange powder. But when added to water, it forms a bright green solution, which glows under UV light.Despite its name, it contains only carbon, hydrogen and oxygen, and can be safely used as a dye or marker. It is also used in medicine,

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