Pigment encapsulation is exceedingly rare, and it is a cost-intensive process. Both Epson and HP do it. What is even more rare is that a 3rd party ink company has been able to develop this technology independently. Vermont PhotoInkjet is the only third-party ink company in the world that has independently developed pigment encapsulation.
Vermont PhotoInkjet pigment particles are encased inside of a micro-thin layer of acrylic co-polymer to form an encapsulation (like the hard candy shell of an M&M candy). This encapsulation insulates the static charge of the pigment particle and is the #1 reason why ConeColor inks are clog-free. Encapsulation also produces smoother printing due to superior ink droplet shearing.
Although ConeColor and Epson Ultrachrome inks are encapsulated with much better dispersion stability than ordinary pigment inks, it is still a requirement to shake them to get smooth dispersion quality and to re-form the proper viscosity of the ink. This will avoid color shifting while maintaining a trouble-free ink.