Patent ID: 8449957

Claim:
A recording medium comprising: an ink-receiving layer on a substrate, wherein the ink-receiving layer contains a hydrated alumina, an alkylsulfonic acid having 1 to 4 carbon atoms, and at least one salt of a sulfur compound represented by general formula (1) or (2): R 1 —SO 2 M 1 general formula (1) R 2 —SO 2 -SM 2 general formula (2) wherein R 1 and R 2 each represent an alkyl group, an aryl group, or a heterocyclic group; and M 1 and M 2 each represent an alkali metal, ammonium, or an alkanolamine, wherein the proportion of the alkylsulfonic acid having 1 to 4 carbon atoms is in the range of 1.0% by mass to 2.0% by mass with respect to the hydrated alumina, and the proportion of the salt of the sulfur compound is in the range of 0.2% by mass to 4.0% by mass with respect to the hydrated alumina.