Color Conundrums

Answer Yes. The difference between the two is solubility, a parameter that depends on the solute (pigment or dye) and the solvent. For example, permanent marker inks contain water-insoluble pigments that dissolve in pyridine. 

Analytical chemists work routinely with dyes even if they are unaware of it. Most acid-base indicators are dyes, as are a number of products of presumptive tests discussed in Chapter 7. Histological stains used in biological disciplines are also dyes. As mentioned, dyes are oiganic compounds that are soluble in the media they are contained in (such as ink or paint). Dyes also have an affinity for the substrate they are being placed on (such as paper). Pigments, by contrast, are typically metallics or organometalUcs that contain a 

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Margulis D. Photoshop Lab Color (2006) The Canyon Conundrum and Other Adventures in the Most Powerful Color space. Berkeley, Calif. London Peachpit Pearson Education... 

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