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Difference between dye and pigment

  1. Feb 15, 2015 #1
    Hello Forum,

    What is the chemical difference between a dye and a pigment? Are most objects around us colored by pigments or dyes? Both are responsible for giving color to objects....

    I know that pigments are insoluble while dyes are soluble...

    Best,
    fog37
     
  2. jcsd
  3. Feb 15, 2015 #2

    Borek

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    Are you sure these things are defined precisely enough to make classification always possible? Or - are you sure there are no substances that can be classified as both?

    Also note that "solubility" is a too not well defined. Everything dissolves to some extent. Whether - for practical purposes - we call something soluble or insoluble, often depends on application.
     
  4. Feb 15, 2015 #3
    Hello Borek,

    I agree about solubility: it all depends on the solvent used.

    As far as the distinction between dye and pigment, I am not sure. I always hear about pigments in relation to color....
     
  5. Feb 15, 2015 #4

    Bystander

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    From Wiki, "A distinction is usually made between a pigment, which is insoluble in its vehicle (resulting in a suspension), and a dye, which either is itself a liquid or is soluble in its vehicle (resulting in a solution). A colorant can act as either a pigment or a dye depending on the vehicle involved. In some cases, a pigment can be manufactured from a dye by precipitating a soluble dye with a metallic salt. The resulting pigment is called a lake pigment. The term biological pigment is used for all colored substances independent of their solubility."
     
  6. Feb 15, 2015 #5
    In textile manufacture, pigments are particulates and dyes are soluble colorants. A widely used pigment is TiO2.

    Chet
     
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