Assessment of the chemical properties of urine is done by immersing a special, chemically prepared strip of paper into a clean urine specimen, or by combining drops of urine with chemically prepared tablets. the of the strip or tablet indicates the presence of any of unique chemical properties.

color of the strips

Explanation:

According to my research on studies conducted by various medical professionals, I can say that based on the information provided within the question the change in color of the strips is what indicates the presence of a certain chemical property within the urine/body of the individual. There are many strips, each with a different chemical embedded within it to test for different things. The picture below shows many of the most commonly used strips by medical professionals.

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