Executive Technical Summary: Wetness indicators provide parents and healthcare nurses with an instant visual indicator of diaper saturation.
Modern wetness indicators utilize food-grade pH-sensitive dyes dissolved in hot-melt resin. In dry conditions (pH < 6.0), the indicator displays an amber-yellow tone. Upon contact with urine (pH 6.5–7.5), proton transfer triggers an instantaneous chromophore shift to deep blue.
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