Metal Indicator
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 titrant and become yellow once it reaches its endpoint.
RED to Yellow indicator during metal titrations, it will appear red in the titrant and become yellow once it reaches its endpoint. Refer this link to get more details --- http://rxmarine.com/Xylenol-Orange-Tetrasodium-Salt-Acs-Grade
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