The Webster's test is a qualitative

urine Urine is a liquid by-product of metabolism in humans and many other animals. In placental mammals, urine flows from the Kidney (vertebrates), kidneys through the ureters to the urinary bladder and exits the urethra through the penile meatus (mal ...

test used to detect the presence of

trinitrotoluene Troponin T (shortened TnT or TropT) is a part of the troponin complex, which are proteins integral to the contraction of skeletal and heart muscles. They are expressed in skeletal and cardiac myocytes. Troponin T binds to tropomyosin and help ...

and its

metabolites In biochemistry, a metabolite is an intermediate or end product of metabolism. The term is usually used for small molecules. Metabolites have various functions, including fuel, structure, signaling, stimulatory and inhibitory effects on enzymes, c ...

. The test was developed in 1917 by T. A. Webster in London as a way to test for trinitrotoluene poisoning. A positive test results in a purple color for the acidified urine samples.

References

Urine tests Toxicology Trinitrotoluene {{med-diagnostic-stub