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Methods for rendering a cyanide or cyanide-containing compound substantially insoluble in an aqueous solution or suspension of cyanide-containing materials comprising: mixing a reagent comprising a thiosulfate salt with said solution or suspension; and adding to said material a complexing agent sele

Methods for rendering a cyanide or cyanide-containing compound substantially insoluble in an aqueous solution or suspension of cyanide-containing materials comprising: mixing a reagent comprising a thiosulfate salt with said solution or suspension; and adding to said material a complexing agent selected from the group consisting of divalent copper salts, divalent iron salts, divalent cobalt salts, activated carbon and mixtures of the foregoing are provided.

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Methods for rendering a cyanide or cyanide-containing compound substantially insoluble in an aqueous solution or suspension of cyanide-containing materials comprising: mixing a reagent comprising a thiosulfate salt with said solution or suspension; and adding to said material a complexing agent sele

Methods for rendering a cyanide or cyanide-containing compound substantially insoluble in an aqueous solution or suspension of cyanide-containing materials comprising: mixing a reagent comprising a thiosulfate salt with said solution or suspension; and adding to said material a complexing agent selected from the group consisting of divalent copper salts, divalent iron salts, divalent cobalt salts, activated carbon and mixtures of the foregoing are provided. ode gap is about 50 μm. 5. A method as claimed in claim 4, wherein said negative electrodes each have a diameter of about 15 μm and are spaced from one another by a distance of about 48 μm. 6. A method as claimed in claim 1, wherein a pulsed bias voltage of about -2 volts with a pulse duration of 4 microseconds is applied to said negative electrodes. 7. A method as claimed in claim 1, wherein said negative electrodes are formed of an electrolytically inert metal selected from the group consisting of chromium, nickel, stainless steel and titanium. 8. A method as claimed in claim 7, wherein said electrolytically inert metal comprises stainless steel. 9. A method as claimed in claim 1, wherein said positive electrode is a cylindrical electrode having a central longitudinal axis and rotating at substantially constant speed about said longitudinal axis, and wherein said printing stages are arranged around said positive cylindrical electrode. 10. A method as claimed in claim 9, wherein said positive electrode is formed of stainless steel. 11. A method as claimed in claim 1, wherein after step (d), any remaining coagulated colloid is removed from the positive electrode active surface. 12. A multicolor electrocoagulation printing apparatus comprising: a positive electrolytically inert electrode having a continuous passivated surface defining a positive electrode active surface; means for moving said positive electrode active surface at a substantially constant speed along a predetermined path; means for coating said positive electrode active surface with an olefinic substance to form on the surface micro-droplets of olefinic substance; a plurality of printing units arranged at predetermined locations along said path, each printing unit comprising: a series of negative electrolytically inert electrodes each having a cylindrical configuration with a predetermined cross-sectional dimension and an end surface covered with a passive oxide film, the negative electrodes being electrically insulated from one another and arranged in rectilinear alignment so that the end surfaces thereof define a plurality of corresponding negative electrode active surfaces disposed in a plane spaced from the positive electrode active surface by a constant predetermined gap, said negative electrodes being spaced from one another by a distance smaller than the electrode gap; means for filling the electrode gap with an eletrocoagulation printing ink comprising a liquid colloidal dispersion containing an electrolytically coagulated colloid, a dispersing medium, a soluble electrolyte and a coloring agent; means for applying to the negative electrodes a pulsed bias voltage ranging from -1.5 to -40 volts and having a pulse duration of 15 nanoseconds to 6 microseconds, the bias voltage applied being inversely and non-linearly proportional to the pulse duration; means for applying to selected ones of said negative electrodes a trigger voltage sufficient to energize same and cause point-by-point selective coagulation and adherence of the colloid onto the olefin-coated positive electrode active surface opposite the electrode active surfaces of said energized electrodes while said positive electrode active surface is moving, thereby forming dots of colored, coagulated colloid; and means for removing any remaining non-coagulated colloid from said positive electrode active surface; wherein said printing units each use a coloring agent of different color so as to form a plurality of dots of differently colored, coagulated colloid on the olefin-coated positive electrode active surface; the distance between the negative electrodes of each printing unit being at least three times the cross-sectional dimension of each negative electrode to permit juxtaposition of said dots of differently colored, coagulated colloid, thereby forming a plurality of colored pixels representative of a desired polychromic image and each comprising juxtaposed dots of differently colore