Matting liquid for ink-jet printing

1. A system for printing an image on a glossy media substrate with variable levels of gloss from a single ink set, comprising:

a) a glossy media substrate;

b) an ink set, comprising:

i) at least one pigmented ink-jet ink including an anionic surface charged pigment dispersed in a first liquid vehicle; and

ii) a substantially colorless matting liquid with at least one matting agent dispersed or solvated in a second liquid vehicle,

wherein when the pigmented ink-jet ink is printed on the glossy media substrate alone, the pigmented ink jet ink has a glossy appearance, and wherein when the colorless matting liquid is overprinted or underprinted with respect to the pigmented ink-jet ink on the glossy media substrate, the pigmented ink-jet ink combined with the matting liquid exhibits a visually perceptible increased matte appearance compared to the glossy appearance.

2. The system of claim 1 , wherein the matting agent is a water-soluble polymer.

3. The system of claim 2 , wherein the water-soluble polymer is selected from polyethyleneimine, polybiguanide, polyamine, dicyandiamide resin, and combinations thereof.

4. The system of claim 1 , wherein the matting agent is a reactive multivalent salt.

5. The system of claim 4 , wherein the reactive multivalent salt is selected from magnesium nitrate, calcium nitrate, aluminum nitrate, lanthanum nitrate, iron nitrate and combinations thereof.

6. The system of claim 1 , wherein the matting agent is an acid.

7. The system of claim 6 , wherein the acid is selected from succinic acid, acetic acid, ascorbic acid, glutaric acid, glycolic acid, fumaric acid, citric acid, polyacrylic acid, tartaric acid, maleic acid, malonic acid, phthalic acid, phthalic acid isomers, lactic acid, amino acids, oxalic acid and combinations thereof.

8. The system of claim 1 , wherein the ink set is configured to be printed on the glossy media substrate such that the volume ratio of matting liquid to ink-jet ink after the matting liquid has been under printed or over printed with respect to the ink-jet ink is from about 1:20 to about 1:1.

9. The system of claim 1 , wherein the glossy media substrate is coated paper.

10. The system of claim 1 , wherein ink set and glossy media substrate are formulated such that when the matting liquid and the ink-jet ink are printed on the glossy media substrate at a 1:1 volume ratio, the glossy appearance measured at a 20 degree angle of incidence is at least 20 gloss units greater than the increased matte appearance.

11. The system of claim 1 , wherein ink set and glossy media substrate are formulated such that when the matting liquid and the ink-jet ink are printed on the glossy media substrate at a 1:3 volume ratio, the glossy appearance measured at a 20 degree angle of incidence is at least 300% in gloss units greater than the increased matte appearance.

12. The system of claim 1 , wherein the system is configured to print both a matte and a glossy image on a single glossy media substrate.

13. The system of claim 1 , wherein the matting agent is present in the matting liquid at from about 0.2 wt % to about 15 wt %.

14. The system of claim 1 , wherein the matting agent is present in the matting liquid at from about 3.0 percent to about 8.0 percent by weight of the matting liquid.