Selective or controlled "wetting" of particles to the surface of a substrate or medium is effected by ultrasonically generating a micromist of small nebulized magnetic particles, typically of micron or submicron size. In the absence of a magnetic field, exposure of the surface of the substrate or medium to the micromist fails to produce any "wetting" of the particles to the surface. In the presence of a magnetic field, however, the particles are caused to locally "wet" the surface in accordance with the field pattern. Use of a micromist of magnetic ink particles for printing, typing and copying applications is described.
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