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  2. Cobalt (II) chloride - Wikipedia

    en.wikipedia.org/wiki/Cobalt(II)_chloride

    When hydrated the colour changes to a light pink/purple. Cobalt chloride is a common visual moisture indicator due to its distinct colour change when hydrated. The colour change is from some shade of blue when dry, to a pink when hydrated, although the shade of colour depends on the substrate and concentration.

  3. Cobalt compounds - Wikipedia

    en.wikipedia.org/wiki/Cobalt_compounds

    Anhydrous cobalt(II) chloride is blue, while the hexahydrate is magenta in colour. [1] Because the color change of cobalt(II) chloride in different hydrates, it can be used to manufacture color-changing silica gel. Anhydrous cobalt halides react with nitric oxide at 70~120 °C to generate [Co(NO) 2 X] 2 (X = Cl, Br or I).

  4. Color of chemicals - Wikipedia

    en.wikipedia.org/wiki/Color_of_chemicals

    Predicting the color of a compound can be extremely complicated. Some examples include: Cobalt chloride is pink or blue depending on the state of hydration (blue dry, pink with water) so it is used as a moisture indicator in silica gel. Zinc oxide is white, but at higher temperatures becomes yellow, returning to white as it cools.

  5. Humidity indicator card - Wikipedia

    en.wikipedia.org/wiki/Humidity_indicator_card

    The cobalt based HIC producers says that if a humidity indicator is considered an article in the EC definition and therefore has no labeling requirements if the content of cobalt(II) chloride by weight is <0.25%. The T (toxic) and R49 (may cause cancer if inhaled) is not applicable because a humidity indicator cannot be inhaled.

  6. Silica gel - Wikipedia

    en.wikipedia.org/wiki/Silica_gel

    When a visible indication of the moisture content of the silica gel is required, ammonium tetrachlorocobaltate(II) (NH 4) 2 [CoCl 4] or cobalt(II) chloride CoCl 2 is added. [6] This will cause the gel to be blue when dry and pink when hydrated. [6] Due to a link between the cobalt chloride and cancer, it has been forbidden in Europe for use in ...

  7. Why 'Cosmic Cobalt' Is Our Color of the Year for 2025

    www.aol.com/lifestyle/why-cosmic-cobalt-color...

    Cosmic Cobalt has been a favorite color for artists of every era. Getty Images/Wikimedia Commons Artists throughout history—from Vermeer and Klimt to Miro and Mondrian—have used the color ...

  8. Cobalt(III) chloride - Wikipedia

    en.wikipedia.org/wiki/Cobalt(III)_chloride

    Cobalt(III) chloride or cobaltic chloride is an unstable and elusive compound of cobalt and chlorine with formula CoCl 3. In this compound, the cobalt atoms have a formal charge of +3. [1] The compound has been reported to exist in the gas phase at high temperatures, in equilibrium with cobalt(II) chloride and chlorine gas.

  9. Water of crystallization - Wikipedia

    en.wikipedia.org/wiki/Water_of_crystallization

    The cobalt chloride mentioned above occurs as [Co(H 2 O) 6] 2+ and Cl −. In tin chloride, each Sn(II) center is pyramidal (mean O/Cl−Sn−O/Cl angle is 83°) being bound to two chloride ions and one water. The second water in the formula unit is hydrogen-bonded to the chloride and to the coordinated water molecule.