Rhodamine 6G

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What Wikipedia says

Rhodamine 6G is a highly fluorescent rhodamine family dye. It is often used as a tracer dye within water to determine the rate and direction of flow and transport. Rhodamine dyes fluoresce and can thus be detected easily and inexpensively with instruments called fluorometers.

Excerpt from the Wikipedia article “Rhodamine 6G”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Zaereth, Public domain, via Wikimedia Commons.