Composition, method for storing composition, and compound

A composition, comprising:

• at least one compound selected from a group consisting of a first compound represented by formula (2) below and a second compound having a metal atom and a ligand represented by formula (1) below;
• and
• an aqueous solvent,
• wherein in formula (2), R1, R12, R13, and R14 each independently represent a hydrogen atom, a halogen atom, or a hydrocarbon group having 1 to 10 carbon atoms;
• R15 represents a halogen atom, a formyl group, an acetoxy group, a sulfo group, a mesyl group, a nitro group, a nitroso group, a phosphoryl group, or an alkyl group having 1 to 6 carbon atoms;
• and X represents gallium, iridium, indium, rhodium, titanium, or germanium,
• wherein in formula (1), R1 and R2 each independently represent an aliphatic hydrocarbon group having 1 to 6 carbon atoms;
• *1 represents a coordinate bond site with the metal atom;
• and *2 represents a covalent bond site with the metal atom.