Tags: Chemical Compound, Chemical Substance.
Nitrazine or phenaphthazine is a pH indicator dye often used in medicine. More sensitive than litmus nitrazine indicates pH in the range of 4.5 to 7.5. Nitrazine is usually used as the disodium salt. Some uses include: To test vaginal pH during late pregnancy to determine the breakage of the amniotic sac. While vaginal pH is normally acidic a pH above 7.0 can indicate that the amniotic sac has ruptured.
