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Xylenol Blue is a pH indicator dye with pH ranges of pH 1.2 (Red) - pH 2.8 (Yellow), and pH 8.0 (Yellow) - pH 9.6 (Blue).
X 1247 (OTTO) p-Xylenol blue, GR Cas 125-31-5 - used as Detection in Bioanalysis and pH indicator dye.