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Malachite Green Carbinol Base (MGOH, MGCB), a non-fluorescent derivative of Malachite Green (MG), serves as a pH adjustment agent. Under UV light exposure, it releases OH- ions, causing a notable pH shift. When subjected to a high-pressure UV lamp (500 W, 50 W/cm), MGCB transitions swiftly from colorless to deep green [1] [2].