Composition, artificial nail composition, nail decoration material, artificial nail, stored container, image forming apparatus, and image forming method

A composition, comprising:

• 49% to 86% by mass relative to the total amount of the composition of an acrylamide compound;
• urethane (meth)acrylate;
• and
• a polymerization initiator,
• wherein the composition has a Simulation Index (SI) value of 3 or less in a skin sensitization test,
• wherein the polymerization initiator is at least one selected from the group consisting of polyethylene glycol 200-di(β-4(4-(2-dimethylamino-2-benzyl)butanonylphenyl)piperazine), 1,3-di({α-[1-chloro-9-oxo-9H-thioxanthen-4-yl)oxy]acetyl poly[oxy(1-methylethylene)]}oxy)-2,2-bis({α-[1-chloro-9-oxo-9H-thioxanthen-4-yl)oxy]acetyl poly[oxy(1-methylethylene)]}oxymethyl)propane, a mixture of 1,3-di({α-4-(dimethylamino)benzoyl poly[oxy(1-methylethylene)]}oxy)-2,2-bis({α-4-(dimethylamino)benzoyl poly[oxy(1-methylethylene)]}oxymethyl)propane with {α-4-(dimethylamino)benzoyl poly(oxyethylene)-poly[oxy(1-methylethylene)]-poly(oxyethylene)}4-(dimethylamino) benzoate, polybutylene glycol bis(9-oxo-9H-thioxanthinyloxy) acetate, and oligomers of 2-hydroxy-1-(4-isopropenylphenyl)-2-methylpropane-1-one,
• wherein the acrylamide compound is selected from acrylamides A1-1 to A1-5