A multiple-component material, the material comprising: a substrate and a printed layer on the substrate, wherein the printed layer includes a color-changing composition, the color-changing composition comprising: a matrix-forming component; a colorant; a surfactant; and a pH adjuster, wherein the pH adjuster includes a low molecular weight organic acid and a high molecular weight organic acid, and wherein the low molecular weight organic acid is selected from lactic acid, amino acid, ascorbic acid, glycolic acid, salicylic acid, tartaric acid, citric acid, EDTA, tartronic acid, maleic acid, oxalic acid, palmitic acid and stearic acid; and the high molecular weight organic acid has a molecular weight greater than 1000 Daltons, and is selected from polyacrylic acids, polymethacrylic acids and copolymers containing acrylic acids, methacrylic acids or both acrylic acids and methacrylic acids; and wherein the matrix-forming component is selected from a water-insoluble, film-forming polymer, a flexographic varnish including an organic solvent or an ink base comprising a polymeric material selected from polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene glycol, water-insoluble derivatives of polyacrylates and polyacrylamides, poly(hydroxyethyl methacrylates), poly(hydroxylethyl acrylates), carboxymethyl cellulose, gelatin and gum Arabic. a substrate and a printed layer on the substrate, wherein the printed layer includes a color-changing composition, the color-changing composition comprising: a matrix-forming component; a colorant; a surfactant; and a pH adjuster, wherein the pH adjuster includes a low molecular weight organic acid and a high molecular weight organic acid, and wherein the low molecular weight organic acid is selected from lactic acid, amino acid, ascorbic acid, glycolic acid, salicylic acid, tartaric acid, citric acid, EDTA, tartronic acid, maleic acid, oxalic acid, palmitic acid and stearic acid; and the high molecular weight organic acid has a molecular weight greater than 1000 Daltons, and is selected from polyacrylic acids, polymethacrylic acids and copolymers containing acrylic acids, methacrylic acids or both acrylic acids and methacrylic acids; and wherein the matrix-forming component is selected from a water-insoluble, film-forming polymer, a flexographic varnish including an organic solvent or an ink base comprising a polymeric material selected from polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene glycol, water-insoluble derivatives of polyacrylates and polyacrylamides, poly(hydroxyethyl methacrylates), poly(hydroxylethyl acrylates), carboxymethyl cellulose, gelatin and gum Arabic. a matrix-forming component; a colorant; a surfactant; and a pH adjuster, wherein the pH adjuster includes a low molecular weight organic acid and a high molecular weight organic acid, and wherein the low molecular weight organic acid is selected from lactic acid, amino acid, ascorbic acid, glycolic acid, salicylic acid, tartaric acid, citric acid, EDTA, tartronic acid, maleic acid, oxalic acid, palmitic acid and stearic acid; and the high molecular weight organic acid has a molecular weight greater than 1000 Daltons, and is selected from polyacrylic acids, polymethacrylic acids and copolymers containing acrylic acids, methacrylic acids or both acrylic acids and methacrylic acids; and wherein the matrix-forming component is selected from a water-insoluble, film-forming polymer, a flexographic varnish including an organic solvent or an ink base comprising a polymeric material selected from polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene glycol, water-insoluble derivatives of polyacrylates and polyacrylamides, poly(hydroxyethyl methacrylates), poly(hydroxylethyl acrylates), carboxymethyl cellulose, gelatin and gum Arabic.