Abstract: The disclosure relates to compositions for treating keratinous substrates, such as the hair, comprising 2-(2-aminoethoxy)ethanol and at least one carboxylic acid, as well as systems and methods for treating keratinous substrates with the compositions.

Abstract: The disclosure relates to compositions for treating keratinous substrates, such as the hair, comprising monoethanolamine and at least one carboxylic acid, as well as systems and methods for treating keratinous substrates with the compositions.

Abstract: The disclosure relates to compositions for treating keratinous substrates, such as the hair, comprising 3-butoxypropylamine and at least one carboxylic acid, as well as systems and methods for treating keratinous substrates with the compositions.

Abstract: The disclosure relates to compositions for treating keratinous substrates, such as the hair, comprising at least one monoamine and at least one carboxylic acid, as well as systems and methods for treating keratinous substrates with the compositions.

Abstract: The present disclosure relates to kits and methods, which are particularly useful for repairing, strengthening, and protecting hair from damage. The kits and methods employ one or more booster compositions, which can be added to a separate hair-treatment composition for application to the hair, or can be applied individually to the hair in a sequence with a separate hair-treatment composition. The booster compositions include: at least 0.5 wt. % of at least one amino acid or amino sulfonic acid, and/or a salt thereof; at least 0.5 wt. % of at least one non-polymeric mono, di, or tricarboxylic acid, and/or a salt thereof; and water. Hair treated with the kits and methods exhibit desirable cosmetic properties such as smoothness, gloss, improved combability, and enhanced strength and elasticity.

Abstract: The present disclosure relates to kits and methods for treating hair. The kits and methods incorporate each of the following components, together, separately, or in any combination thereof, in one or more hair-treatment compositions, provided that each individual component is included in a hair-treatment composition of the kit or method: (a) at least one amino acid or amino sulfonic acid, and/or a salt thereof, which is present in at least one of the one or more hair-treatment compositions in an amount of at least 0.5 wt. %; (b) a first non-polymeric mono, di, or tricarboxylic acid, and/or a salt thereof, which is present in at least one of the one or more hair-treatment compositions in an amount of at least 0.5 wt. %; (c) a second non-polymeric mono, di, or tricarboxylic acid, and/or a salt thereof, which is present in at least one of the one or more hair-treatment composition in an amount of at least 0.5 wt.

Abstract: The disclosure relates to compositions for treating keratinous substrates, such as the hair, comprising monoethanolamine and at least one carboxylic acid, as well as systems and methods for treating keratinous substrates with the compositions.

Abstract: The disclosure relates to systems and compositions comprising the systems for use in chemical treatment of keratinous substrates, such as the hair. The systems and compositions comprising the systems comprise at least one active agent and at least one acid. Methods of treating keratinous substrates with the systems and compositions comprising the systems are also disclosed.

Abstract: The disclosure relates to compositions for treating keratinous substrates, such as the hair, comprising monoethanolamine and at least one carboxylic acid, as well as systems and methods for treating keratinous substrates with the compositions.