Abstract: An example of a pre-treatment fixing fluid for an offset coated medium includes calcium propionate, calcium pantothenate, tetraethylene glycol, a surfactant having an HLB less than 10, an acid, and a balance of water. The calcium propionate is present in an amount ranging from greater than 4.5 wt % to 8.0 wt %, the calcium pantothenate is present in an amount ranging from about 2.0 wt % to equal to or less than 15 wt %, and the surfactant is present in an amount ranging from about 0.01 wt % to about 1.0 wt %, each based on the total wt % of the pre-treatment fixing fluid. The acid is present in an amount sufficient to render the pH from about 4.0 to about 7.0.

Abstract: A fixer composition is disclosed herein. An example of the fixer composition includes from about 5 wt % to about 25 wt % of a co-solvent, from about 1 wt % to about 20 wt % of a calcium salt, from about 0.01 wt % to about 0.6 wt % of a sulfonated chelating agent, and a balance of water.

Abstract: An ink composition is disclosed herein. The ink composition includes from about 5 wt % to about 25 wt % of a co-solvent; from about 0.025 wt % to about 0.2 wt % of i) a chelating agent represented by formula 1, wherein R? is a carboxylic acid functional group or a carboxylate salt functional group and n>2; ii) a chelating agent represented by formula 2:, wherein R is a carboxylic acid functional group or a carboxylate salt functional group, m is greater than or equal to 1, x is greater than or equal to 2, y is greater than or equal to 1, and z is greater than or equal to 2; iii) a chelating agent represented by formula 3, wherein any of r, s, t, or u is a sulfonic acid functional group or a sulfonate functional group; or iv) combinations of any of i, ii, and iii. The ink composition also includes a balance of water.