Difference between dye and pigment

  • Thread starter fog37
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  • #1
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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
 

Answers and Replies

  • #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.
 
  • #3
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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....
 
  • #4
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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."
 
  • #5
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In textile manufacture, pigments are particulates and dyes are soluble colorants. A widely used pigment is TiO2.

Chet
 

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