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Nitrazine Yellow is used to test vaginal pH during late pregnancy to determine the breakage of the amniotic sac. To perform a fecal pH test for diagnosing intestinal infections or other digestive problems. In civil engineering, to determine the carbonatation spread in concrete structures and therefore assess the state of the rebar's passivation film.
Angela M. Mills and D. B. Garrioch. Use Of The Nitrazine Yellow Swab Test In The Diagnosis Of Ruptured Membranes. BJOG: An International Journal of Obstetrics & Gynaecology. 1977, 84 (2), 138-140.
Lien Van der Schueren; Karen Hemelsoet; Veronique Van Speybroeck; Karen De Clerck. The influence of a polyamide matrix on the halochromic behaviour of the pH-sensitive azo dye Nitrazine Yellow. Dyes and Pigments. 2012, 94 (3), 443-451.