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Test for primary aromatic amines produces a bright orange at the top of the test lane with 100% sulfadoxine (F) and a sulfadoxine/pyrimethamine combination (G) compared with water (A) or starch (B). Sulfadoxine cut with calcium carbonate (w/w) to concentrations of 10% (C), 40% (D), and 70% (E) also produce the positive outcome with only small reductions in sensitivity.
