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• O-Cresolphthalein Complexone
• Bis(1-aminoguanidinium) sulphate
• 4-Dimethylaminobenzaldehyde
• Picramic acid sodium hydrate
• 3-Indolebutyric acid
• Bromocresol green，sodium salt
• Alkali blue 6B sodium
• 4-(2-Pyridylazo)resorcinol
• 1-(2-Pyridylazo)-2-naphthol
• Coumarin
• Vanillin
• Phenol Red sodium salt

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