Ink Set And Printing Method

An ink set comprising:

• an ink composition;
• and
• a treatment liquid composition,
• wherein
• each of the ink composition and the treatment liquid composition is used for printing by being applied onto a printing medium by an ink jet method,
• the ink composition is a water-based composition containing a coloring material and a surfactant,
• the treatment liquid composition is a water-based composition containing a flocculant and a surfactant,
• each of the surfactant contained in the ink composition and the surfactant contained in the treatment liquid composition includes a silicone surfactant whose 0.1 mass % aqueous solution has a surface tension of 32 mN/m or less,
• any one of the surfactant contained in the ink composition and the surfactant contained in the treatment liquid composition includes a silicone surfactant whose 0.1 mass % solution in a nitrogen-containing solvent has a surface tension of 32 mN/m or less, and
• any one of the ink composition and the treatment liquid composition contains any one of a nitrogen-containing solvent, a sulfur-containing solvent, and a cyclic ester.