Video narration
How can a small strip turn urine into a pH reading through color alone? Like school-lab indicator paper, it uses an acid-base indicator: a molecule whose color responds to acidity. But commercial formulations differ; this is a general model, not every product's exact chemistry. pH reflects hydrogen-ion activity and shifts the balance between indicator forms. In HIn ⇌ H+ + In−, protonation adds a proton; deprotonation releases it. The color is not a direct label for pH. It is the visible result of molecules changing form and absorbing light differently. Each form absorbs different visible wavelengths, changing the color your eye sees. Compare the patch with its reference chart at the manufacturer's specified time, following handling instructions. That gives an estimate of urine pH, not a diagnosis. Indicator molecules shift form with pH, making a color reading possible. Small Molecules. Powerful Chemistry. Visible Results.