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Abstract

The invention provides a recording medium having 2 or more ink receiving layers on a substrate, wherein an upper layer of the ink receiving layers, which is a layer most distant from the substrate, and a lower layer, which is a layer located just under the upper layer, contain at least one selected from alumina hydrate and alumina, an acid and a hydrophilic binder, the acid contained in the upper layer is a carboxylic acid represented by the general formula [I], and the acid contained in the lower layer is a sulfonic acid represented by the general formula [II]

description='In-line Formulae' end='lead'R¹—COOH  General formula [I]description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'R²—SO₃H.  General formula [II]description='In-line Formulae' end='tail'

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First Claim