distribution has been achieved and that the particles have a near spheroid shape in place of the sub micronizer other devices can be used among such as cherry burrell viscolizer a gaulin colloid mill a charlotte colloid mill or the like these devices subject the mixture to an intense hydraulic shear action in a rotary spiral flow pattern that in the presence of a low concentration of dye solvent spheroidizes the disperse dye particles most of these mills pump the fluid mixture under high pressure through a narrow opening between a valve plug and its seat as a result the stream develops a very high velocity as it passes through the extremely small opening the combination of this velocity and the frictional drag of the material in actual contact with the surfaces of the valve plug and seat causes extreme internal shear to develop within the dispersion tending to break down the particle size of the dispersed phase an explosive effect also occurs as the particles are released from the zone of high pressure to atmospheric pressure a variety of these devices is available some of which combine the action of grinding mixing and homogenizing the preferred colloid mills for the purposes of the present invention are those that through the combination of chemical solvent attack and rotational hydrodynamic forces reduce particles to a uniform sub micron size in the range of 0 01 to 0 5 microns 10 to 500 nm while causing the dye particles.