Pre-treatment fixing fluid

A method for improving uncapped start up performance of an inkjet fixer pen, the method comprising:

• preparing a pre-treatment fixing fluid, including:
• calcium-containing cationic crashing agents consisting of calcium propionate and calcium nitrate, wherein the calcium propionate is present in an amount ranging from 0 wt % to about 10 wt % based on a total wt % of the pre-treatment fixing fluid, and wherein the calcium nitrate is present in an amount ranging from about 15 wt % to 0 wt % based on the total wt % of the pre-treatment fixing fluid,
• a pre-treatment fixing fluid co-solvent,
• a surfactant being selected from the group consisting of a first surfactant having a first hydrophilic lipophilic balance (HLB) value within a hydrophobic range and a combination of the first surfactant and a second surfactant having a second HLB value within a water dispersible range, and
• a balance of water;
• and
• loading the pre-treatment fixing fluid into the inkjet fixer pen.

A coated offset medium, comprising:

• a print medium coated with a coating that contains a hydrophobic polymer and forms a nonporous smooth surface;
• and
• a pre-treatment fixing coating on the nonporous smooth surface of the coated offset medium, the pre-treatment fixing coating including:
• calcium-containing cationic crashing agents consisting of calcium propionate and calcium nitrate, wherein the calcium propionate is present in an amount ranging from 0 wt % to about 10 wt % based on a total wt % of the pre-treatment fixing coating, and wherein the calcium nitrate is present in an amount ranging from about 15 wt % to 0 wt % based on the total wt % of the pre-treatment fixing coating, and
• a surfactant being selected from the group consisting of a first surfactant having a first hydrophilic lipophilic balance (HLB) value within a hydrophobic range and a combination of the first surfactant and a second surfactant having a second HLB value within a water dispersible range.