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Reel, phenophthalein, 7 mm × 5 m, pH indicators and test papers, dispenser Reel, phenophthalein, dispenser. Instant pH readings. Accurate for a wide range of routine pH testing. Inexpensive. Convenient and portable for field use. GE Healthcare offers a range of pH indicator and test papers to meet specific needs. These highquality products combine easeofuse with unsurpassed accuracy and consistency. The convenience of using indicator papers for the rapid determination of pH values has led to many applications in laboratories and in industry. This white paper changes to pink at pH 8.3 and becomes red at pH 10. It is useful for the determination of the neutralization point in weak acid/strong alkali reactions. Phenolpthalein

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