Xylenol orange

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Xylenol orange is an organic reagent, most commonly used as a tetrasodium salt as an indicator for metal titrations. When used for metal titrations, it will appear red in the titrand and become yellow once it reaches its endpoint.

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

Image: NEUROtiker, Public domain, via Wikimedia Commons.