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  2. Litmus - Wikipedia

    en.wikipedia.org/wiki/Litmus

    Litmus paper after being used. The main use of litmus is to test whether a solution is acidic or basic, as blue litmus paper turns red under acidic conditions, and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F). Neutral litmus paper is purple. [2]

  3. Flame test - Wikipedia

    en.wikipedia.org/wiki/Flame_test

    A flame test involves introducing a sample of the element or compound to a hot, non-luminous flame and observing the color of the flame that results. [4] The compound can be made into a paste with concentrated hydrochloric acid, as metal halides, being volatile, give better results. [5] Different flames can be tried to verify the accuracy of ...

  4. Universal indicator - Wikipedia

    en.wikipedia.org/wiki/Universal_indicator

    If the test solution is of a dark colour, it is preferable to use a paper universal indicator, such as Hydrion paper. Solution: The main components of a universal indicator, in the form of a solution, are thymol blue , methyl red , bromothymol blue , and phenolphthalein .

  5. Chemical Agent Detector Paper - Wikipedia

    en.wikipedia.org/wiki/Chemical_Agent_Detector_Paper

    M9 Detector Tape or paper is used to detect the presence of nerve (V- and G- types) and mustard (H, HD, HN, and HT) agents. [3] It cannot identify what particular agent it is being exposed to. The tape is typically a dull cream color when not exposed to chemical agents, but will turn red in the presence of chemical agents. [ 4 ]

  6. List of reagent testing color charts - Wikipedia

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

    Reagent test Alcohols: Forms Lucas test in alcohols is a test to differentiate between primary, secondary, and tertiary alcohols. Alkaloids: Forms Froehde Liebermann Mandelin Marquis Mayer's Mecke Simon's: Amines, and amino acids: Forms Folin's: Barbiturates: Class Dille–Koppanyi Zwikker: Benzodiazepines: Class Zimmermann: Phytocannabinoids ...

  7. pH indicator - Wikipedia

    en.wikipedia.org/wiki/PH_indicator

    The word litmus is literally from 'colored moss' in Old Norse (see Litr). The color changes between red in acid solutions and blue in alkalis. The term 'litmus test' has become a widely used metaphor for any test that purports to distinguish authoritatively between alternatives. Hydrangea macrophylla flowers can change color depending on soil ...

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