Image formation method, decorative sheet, decorative sheet molding, process for producing in-mold molded product, in-mold molded product, and ink set

An image formation method comprising, in order,

• Step a:
• a step of applying Liquid A to a substrate,
• Step b:
• a step of irradiating the applied Liquid A with actinic radiation so as to carry out complete curing or semi-curing up to a degree of cure of at least 90% to form a cured or semi-cured layer,
• Step c:
• a step of applying Liquid B to the cured or semi-cured layer, and
• Step d:
• a step of completely curing any remaining Liquid A and Liquid B,
• Liquid A comprising N-vinylcaprolactam, a first aromatic ring-containing monofunctional acrylate, an aliphatic hydrocarbon ring-containing monofunctional acrylate, a first polysiloxane compound, an acrylic resin having a glass transition temperature of 40° C. to 90° C., a first photopolymerization initiator, and a pigment, the content of the acrylic resin having the glass transition temperature of 40° C. to 90° C. in Liquid A being at least 0.5 mass % but no greater than 5 mass %, and
• Liquid B comprising N-vinylcaprolactam, a second aromatic ring-containing monofunctional acrylate, a second polysiloxane compound, a thermoplastic resin having a glass transition temperature of 70° C. to 110° C., and a second photopolymerization initiator, the content of the thermoplastic resin having the glass transition temperature of 70° C. to 110° C. in Liquid B being at least 20 mass % but no greater than 50 mass %.