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  2. Tollens' reagent - Wikipedia

    en.wikipedia.org/wiki/Tollens'_reagent

    Another test relies on reaction of the furfural with phloroglucinol to produce a colored compound with high molar absorptivity. [4] It also gives a positive test with hydrazines, hydrazones, α-hydroxy ketones and 1,2-dicarbonyls. Both Tollens' reagent and Fehling's reagent give positive results with formic acid. [citation needed]

  3. Urine test strip - Wikipedia

    en.wikipedia.org/wiki/Urine_test_strip

    The urine test strip test for blood is based on hemoglobin's pseudo peroxidase activity in catalysing a reaction between hydrogen peroxide and the chromogen tetramethylbenzidine in order to produce a dark blue oxidation product. [6] [13] the resultant colour can vary between green and dark blue depending on the amount of hemoglobin. [13]

  4. Nitrite test - Wikipedia

    en.wikipedia.org/wiki/Nitrite_test

    A nitrite test is a standard component of a urinary test strip. A positive test for nitrites in the urine is called nitrituria. This test is commonly used in diagnosing urinary tract infections (UTIs). A positive nitrite test indicates that the cause of the UTI is a Gram-negative organism, most commonly Escherichia coli. The reason for nitrites ...

  5. List of reagent testing color charts - Wikipedia

    en.wikipedia.org/wiki/List_of_reagent_testing...

    It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2] For this reason it is essential to use multiple different tests to show all adulterants.

  6. Tollens test - Wikipedia

    en.wikipedia.org/?title=Tollens_test&redirect=no

    This page was last edited on 5 October 2019, at 23:46 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...

  7. Urinalysis - Wikipedia

    en.wikipedia.org/wiki/Urinalysis

    Test strips that use Ehrlich's reagent can give false positive results in the presence of porphobilinogen and numerous drugs. [86] Decreased levels of urobilinogen cannot be detected by the dipstick method. Like bilirubin, urobilinogen is sensitive to light. [87]