Toluidine blue

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Science and technology

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What Wikipedia says

Toluidine blue, also known as TBO or tolonium chloride (INN) is a blue cationic (basic) dye used in histology (as the toluidine blue stain) and sometimes clinically.

Excerpt from the Wikipedia article “Toluidine blue”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: MaloDufay, CC BY-SA 4.0, via Wikimedia Commons.