Patent ID: 8567938

Claim:
A method of producing a print on semiporous recording medium, comprising: drying a selected region of the semiporous recording medium to a moisture content not to exceed that of the recording medium equilibrated to 20% RH; depositing hydrophilic liquid in a selected fluid pattern on the selected region of the recording medium within 15 seconds after the completion of drying, so that the hydrophilic liquid wets an image area of the recording medium corresponding to the selected fluid pattern, and the resistivity of the wetted area of the semiporous recording medium becomes no greater than 5×10 11 Ω-cm; charging the recording medium so that a charge pattern of charged and discharged areas is formed on the recording medium, wherein the discharged areas correspond to the image area; and depositing onto the recording medium charged dry ink having charge of the same sign as the charge in the charged areas on the recording medium, the dry ink being deposited in a dry ink pattern corresponding to the selected fluid pattern in the selected region, the dry ink being at least in part hydrophilic, so that the deposited dry ink adheres to the hydrophilic liquid, and at least some of the hydrophilic liquid is drawn into or around the deposited dry ink; wherein the dry ink does not include a colorant.