Inkjet recording is a recording method wherein droplets of ink are ejected through fine nozzles to form letters or figures on the surface of recording media.

Colorants for inkjet ink used in large format or desktop printer may be generally classified as dyes or pigments. Accordingly, any inkjet inks may incorporate dye(s), pigment(s), or a combination of dye(s) and pigment(s) to print images on the recording media. Of these three, dye-based thermal inkjet ink compositions are most widely available commercially.

One reason that dyes are sometimes selected over pigments concerns the expansive color saturation and higher brightness due to the fact that dyes are easily dissolved and well separately existed as molecules in water. Also, the mechanics of printing dye-based inks via inkjet recording methods are simpler than those of printing pigment-based inks since pigments often constitute relatively large particles dispersed in medium, as opposed to the molecules of dyes. These particles of pigment may influence the mechanism of drop formation and consequently may enhance the difficulty of achieving good printing performance, such as drop volume,
velocity, etc.

Furthermore, owing to the particle form of pigments, there is a tendency for the pigments to sediment, agglomerate and flocculate if the pigments are not well dispersed in the suspension medium of the ink over the
long term.

However, despite these advantages of dye-based inks, there is motivation to use pigments instead of dyes in printing inks due to the enhanced light fastness and water fastness characteristics of pigments. TFC has
cooperated with Union Chemical Laboratories of Industrial Technology Research Institute to develop the ultrafine grinding technology to disperse organic pigments in water since 2000. Successfully, we can reduce
the particle sizes of organic pigments to primary partices¡]lower than 30-50 nm¡^and obtain very stable dispersions with a very uniform particle size distribution. The uniform pigment dispersion with ultrafine particle size obviously enhance the color transparency and saturation due to the fact that the light scattering is reduced by the particle size reduction.

Light scattering Phenomenon causing by the particle size.

The light scattering is reduced by the reduction of particle size resulting the improved color purity.