Print media

A method of making a print medium, comprising:

• treating a first surface of cellulose-based paper substrate with a treatment solution including an electrolyte compound to form an electrically charged treatment layer, wherein the electrically charged treatment layer is electrically charged with calcium chloride, calcium acetate, calcium nitrate, calcium formate, magnesium chloride, barium chloride, manganese sulfate, magnesium nitrate, magnesium acetate, magnesium formate, zinc chloride, zinc sulfate, zinc nitrate, zinc formate, tin chloride, tin nitrate, manganese chloride, manganese sulfate, manganese nitrate, manganese formate, aluminum sulfate, aluminum nitrate, aluminum chloride, aluminum acetate, or a combination thereof;
• coating the electrically charged treatment layer with ink-absorbing coating composition including polymeric binder and surface-activated fumed silica particles to form an ink-absorbing layer, the surface-activated fumed silica particles comprising fumed silica particles that are surface-activated with charged multivalent aluminum salt and organosilane reagent;
• and
• coating the ink-absorbing layer with an ink-receiving coating composition that includes colloidal silica particles, alumina particles, or both to form an ink-receiving layer including amorphous silica particles, alumina particles, or a combination thereof.

A method of printing, comprising jetting an ink composition onto a print medium, wherein the print medium includes:

• a cellulose-based paper substrate including a first surface and a second surface opposite the first surface, the first surface treated with an electrically charged treatment layer, wherein the electrically charged treatment layer is electrically charged with calcium chloride, calcium acetate, calcium nitrate, calcium formate, magnesium chloride, barium chloride, manganese sulfate, magnesium nitrate, magnesium acetate, magnesium formate, zinc chloride, zinc sulfate, zinc nitrate, zinc formate, tin chloride, tin nitrate, manganese chloride, manganese sulfate, manganese nitrate, manganese formate, aluminum sulfate, aluminum nitrate, aluminum chloride, aluminum acetate, or a combination thereof;
• an ink-absorbing layer on the electrically charged treatment layer, the ink-absorbing layer including a polymeric binder and surface-activated fumed silica particles, wherein the surface-activated fumed silica particles include fumed silica particles that are surface-activated with charged multivalent aluminum salt and organosilane reagent;
• and
• an ink-receiving layer on the ink-absorbing layer, the ink-receiving layer including amorphous silica particles, alumina particles, or a combination thereof.