(57) A method and system for high speed image reproduction by electro-coagulation of an
electrolytically coagulable colloid. A plurality of negative and positive electrolytically
inert electrodes (12, 14) which are electrically insulated from one another are arranged
to define a matrix of dot-forming elements (16), the negative and positive electrodes
of each matrix element having respective planar active surfaces with the negative
electrode active surface extending in the same plane as the positive electrode active
surface and in close proximity thereto. A layer of substantially liquid colloidal
dispersion is applied over the electrode active surfaces of the matrix elements (16),
the colloidal dispersion containing an electrolytically coagulable colloid, a liquid
dispersing medium and a soluble electrolyte, and having a substantially uniform temperature
throughout the layer. The negative and positive electrodes (12, 14) of selected ones
of the matrix elements (16) are electrically energized to cause selective coagulation
and adherence of the colloid onto the positive electrode active surfaces of the selected
matrix elements and to thereby form a series of corresponding dots representative
of a desired image, and any remaining non-coagulated colloid is thereafter removed.
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