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  2. Thermochromism - Wikipedia

    en.wikipedia.org/wiki/Thermochromism

    Thermochromism is the property of substances to change color due to a change in temperature. A mood ring is an example of this property used in a consumer product although thermochromism also has more practical uses, such as baby bottles, which change to a different color when cool enough to drink, or kettles which change color when water is at ...

  3. Color of chemicals - Wikipedia

    en.wikipedia.org/wiki/Color_of_chemicals

    The color of chemicals is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy performed by the ...

  4. Hue-heat hypothesis - Wikipedia

    en.wikipedia.org/wiki/Hue-heat_hypothesis

    Taj Mahal in warm light from a low elevation sun. Taj Mahal in the cold light from a high elevation sun. The hue-heat hypothesis is the hypothesis that an environment with warm colors (red, orange yellow hues) will feel warmer in terms of temperature and comfort, while an environment with cold colors (blue, green hues) will feel cooler.

  5. Flame test - Wikipedia

    en.wikipedia.org/wiki/Flame_test

    The color of the flames also generally depends on temperature and oxygen fed; see flame colors. [5] The procedure uses different solvents and flames to view the test flame through a cobalt blue glass or didymium glass to filter the interfering light of contaminants such as sodium. [12] Flame tests are subject of a number of limitations.

  6. Flame - Wikipedia

    en.wikipedia.org/wiki/Flame

    Here the red color compared to typical yellow color of the flames suggests that the temperature is lower. This is because there is a lack of oxygen in the room and therefore there is incomplete combustion and the flame temperature is low, often just 600 to 850 °C (1,112 to 1,562 °F).

  7. Briggs–Rauscher reaction - Wikipedia

    en.wikipedia.org/wiki/Briggs–Rauscher_reaction

    Oscillogram made in July 1972 by Briggs and Rauscher. The Briggs–Rauscher oscillating reaction is one of a small number of known oscillating chemical reactions.It is especially well suited for demonstration purposes because of its visually striking colour changes: the freshly prepared colourless solution slowly turns an amber colour, then suddenly changes to a very dark blue.

  8. Red heat - Wikipedia

    en.wikipedia.org/wiki/Red_heat

    The practice of using colours to determine the temperature of a piece of (usually) ferrous metal comes from blacksmithing. Long before thermometers were widely available, it was necessary to know what state the metal was in for heat treating it and the only way to do this was to heat it up to a colour which was known to be best for the work.

  9. Color of water - Wikipedia

    en.wikipedia.org/wiki/Color_of_water

    Color-causing dissolved substances such as tannins are only toxic to animals in large concentration. [14] Color from dissolved substances is not removed by typical water filters; however the use of coagulants may succeed in trapping the color-causing compounds within the resulting precipitate. [citation needed] Other factors can affect the ...