Phthalocyanines are absorption pigments which possess very high surface energy, and therefore, tend to self-agglomerate to form coarser particles in paint formulations or in other applications
[20]. The agglomerated particles are generally mechanically crushed into smaller particles or under high shear mixing, and ultrasonic dispersion can also be performed to break the agglomerates[21,22]. The surface of the crushed pigment particles can also be chemically treated to enable the individual particles to stay in a stable dispersed state. However, when stored for an extended period of time the pigment particles can again agglomerate and adversely affect the color
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