Aqueous pigment-material solution, manufacturing method for aqueous pigment-material solution, and blue-colored beverage

Abstract

The present invention provides an aqueous pigment-material solution which has excellent thermal stability and less fading particularly even under an acidic condition, a method for producing the same, and a blue-colored beverage. Provided are an aqueous pigment-material solution including a pigment material containing 20 mmol to 200 mmol of polycarboxylic acid having one or more hydroxy groups, in terms of carboxylic acid equivalent, per 1 g of phycocyanin, in which when both the phycocyanin and the polycarboxylic acid are added such that a color value represented by absorbance at 620 nm is 2.5 to 5, an optical density per 1 cm of an optical path length at 800 nm is 0.05 or lower at a hydrogen ion concentration (pH) of 3 or lower, a method for producing the aqueous pigment-material solution, and a blue-colored beverage.