contact for fd&c red 40 fd&c red 40 by Standardcon

What is Dye » Dyes and Pigments Information

Difference Between Pigments and Dyes Pollution Control Dyeing Units Dyeing Concepts

Both dyes and pigments are powerful colourants. The Basic difference between them is that dyes get dissolve in the substrate, while pigments tend to leave residues.

The major differences between the Dyes and Pigments are highlighted below

Points of Difference Dyes Pigments
Solubility They are soluble Pigments are colourants that are insoluble in water and most of the solvents
Number Available in Large number Comparatively lesser in number
Product resistance Lower as compared to pigments Very high
Lightfastness Lower Dyes are very much vulnerable. Lights destroy colored objects by breaking open electronic bonding within the molecule Traditionally pigments have been found to be more lightfast than dyes
Size Dye molecules are comparatively smaller it's like comparing a football (pigment) to say a head of a pin (dye) Pigment particles are about 1-2 microns in size. (1 micron =1/1000 meter). It means that the particles can be seen under a magnifying glass
Bonding Taking the example of dyeing a wood surface, the dye and the substrate (wood) that is dyed are chemicals, that have certain features called functional groups. At the level of molecules these groups serve as open pockets of electrostatic charges (+ or -). The functional group in dyes, serve as a method for attaching the dye to the wood For example taking the example of a wood surface Pigment requires the help of a binder for gluing. As it is an inert substance which is merely suspended in a carrier/binder
Structure during the application process During application process there is a temporary alteration in the structure of the dyes During application, pigments have the capacity to retain particulate or crystalline structure
Imparting of Colours Dyes can only impart colour by selective absorption of the dyes Pigments impart colours by either scattering of light or by selective absorption
Combustible properties Taking the example of a Candle making process, if the candles are dyed it is easily combustible and can be applied throughout the candle In the example of a candle making as pigments are colored particles, they tend to clog a wick when burned. This makes them undesirable for a candle if it is colored throughout and used for burning
Chemical Composition Usually the dyes are organic (i.e. carbon-based) compounds While pigments are normally inorganic compounds, often involving heavy toxic metals
Longevity factor The dye based printing inks do not last as long as the pigment inks In case of ink based printing prints made with pigments lasts longer
Printing on substrates Compatible with almost all the substrates that needs to be dyed Owing to the physical makeup of the pigment inks the range for suitable substrates are limited
Colour gamut Taking the case of printing inks, dye based inks offers a wide variety As compared to dye-based inks, pigment inksets somewhat lags behind, on the same paper stock


Google

Flag Counter