A dye-capturing laundry aid comprising: a support in the form of a sheet comprising water-insoluble fibers; a first substance anchored to the support, wherein the first substance has moieties that are cationic when exposed to water at one or more pH values in the pH range of from 6 to 10; and a second substance that coats the first substance, wherein the second substance is a polymer, at least 50 % of which remains coated upon the first substance when the laundry aid is exposed to water over the pH range of from 6 to 10 for 60 minutes at 40°C, and at least 50% of the repeating units in the polymer have a structure according to the following Formula: wherein R 1, R 2 and R 3 each independently represents H or a C 1-3 alkyl group, a C 2-3 alkenyl group, a C 3-6 cycloalkyl group, a C 6-10 aryl group or a C 3-6 heterocyclic group, and each of which being optionally substituted with a hydroxyl group; and X represents a covalent bond, a C 1-3 alkylene group, a C 3-6 cycloalkylene group, a C 6-10 arylene group or a C 3-6 heterocyclic group, and wherein: the first substance is a first polymer that is a water-soluble polyamine comprising primary amine groups and is anchored to the support as part of a three-dimensional network entangled with at least some of the fibers contained in the support; and the three-dimensional network comprises the first polymer cross-linked by a third polymer, the third polymer being a water soluble polymer that is different from the first polymer and comprises repeating units comprising halohydrin and/or epoxide groups that are capable of forming covalent cross-links with the primary amine groups of the first polymer. a support in the form of a sheet comprising water-insoluble fibers; a first substance anchored to the support, wherein the first substance has moieties that are cationic when exposed to water at one or more pH values in the pH range of from 6 to 10; and a second substance that coats the first substance, wherein the second substance is a polymer, at least 50 % of which remains coated upon the first substance when the laundry aid is exposed to water over the pH range of from 6 to 10 for 60 minutes at 40°C, and at least 50% of the repeating units in the polymer have a structure according to the following Formula: wherein R 1, R 2 and R 3 each independently represents H or a C 1-3 alkyl group, a C 2-3 alkenyl group, a C 3-6 cycloalkyl group, a C 6-10 aryl group or a C 3-6 heterocyclic group, and each of which being optionally substituted with a hydroxyl group; and X represents a covalent bond, a C 1-3 alkylene group, a C 3-6 cycloalkylene group, a C 6-10 arylene group or a C 3-6 heterocyclic group, and wherein: the first substance is a first polymer that is a water-soluble polyamine comprising primary amine groups and is anchored to the support as part of a three-dimensional network entangled with at least some of the fibers contained in the support; and the three-dimensional network comprises the first polymer cross-linked by a third polymer, the third polymer being a water soluble polymer that is different from the first polymer and comprises repeating units comprising halohydrin and/or epoxide groups that are capable of forming covalent cross-links with the primary amine groups of the first polymer. wherein R 1, R 2 and R 3 each independently represents H or a C 1-3 alkyl group, a C 2-3 alkenyl group, a C 3-6 cycloalkyl group, a C 6-10 aryl group or a C 3-6 heterocyclic group, and each of which being optionally substituted with a hydroxyl group; and X represents a covalent bond, a C 1-3 alkylene group, a C 3-6 cycloalkylene group, a C 6-10 arylene group or a C 3-6 heterocyclic group, and wherein: the first substance is a first polymer that is a water-soluble polyamine comprising primary amine groups and is anchored to the support as part of a three-dimensional network entangled with at least some of the fibers contained in the support; and the three-dimensional network comprises the first polymer cross-linked by a third polymer, the third polymer being a water soluble polymer that is different from the first polymer and comprises repeating units comprising halohydrin and/or epoxide groups that are capable of forming covalent cross-links with the primary amine groups of the first polymer. the first substance is a first polymer that is a water-soluble polyamine comprising primary amine groups and is anchored to the support as part of a three-dimensional network entangled with at least some of the fibers contained in the support; and the three-dimensional network comprises the first polymer cross-linked by a third polymer, the third polymer being a water soluble polymer that is different from the first polymer and comprises repeating units comprising halohydrin and/or epoxide groups that are capable of forming covalent cross-links with the primary amine groups of the first polymer.