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MDhealth.com explains that pink period blood is caused when normal discharge mixes with a small amount of blood. This type of bleeding typically occurs between periods and can be a sign of ovulation or the earliest stage of pregnancy. Know More.
phenol red act as the pH indicator. As the substrate urea is split into products, the presence of ammonia caused alkaline environment that cause the phenol red to turn to deep pink. Useful to test Proteus vulgaris. 3 people found this useful.