Ink set, inkjet recording method, ink medium set, and printing medium

Abstract

An ink set which includes a first ink composition that contains a coloring agent, a surfactant in an amount of A1 mass %, a hydrophobic organic solvent in an amount of A2 mass %, and water, the first ink composition being used to form a first image, and a second ink composition that contains a coloring agent, a surfactant in an amount of B1 mass %, a hydrophobic organic solvent in an amount of B2 mass %, and water, the second ink composition being used to form a second image on the first image. The surfactant is a specific silicone-based surfactant; the octanol/water partition coefficient of the hydrophobic organic solvent is not less than 2.00 but less than 3.50; and the following formula 0.05≤(0.5×(B1−A1)+(B2−A2))≤0.70 is satisfied.