To provide a water-soluble composition or aqueous solution with which it is possible to effectively prevent discoloration and browning even if the subject of discoloration and browning prevention changes. A carbon-dioxide-foamable alkali composition or aqueous solution that achieves a reduction state in carbon dioxide in the alkaline region, and traps pigment by the chelate effect so as to oxidize polyphenols and myoglobin over a long period, said water-soluble composition having, as active ingredients, (1) an organic acid such as acetic acid, ascorbic acid, citric acid and tartaric acid, or an alkali metal or alkaline earth metal salt thereof, (2) an alkali metal or an alkaline earth carbonate, and (3) an alum, and said water-soluble composition characterized in that the alkali metal or the alkaline earth carbonate is dissolved in an aqueous solution of the organic acid or salt thereof, and carbon dioxide is foamed in the weakly alkaline (approximately pH 8) region.本發明提供一種即使防止變色、褐變的對象發生變化亦能夠有效地防止變色、褐變之水溶性組成物或水溶液。本發明的碳酸氣體發泡性鹼組成物或水溶液,係確保鹼性區域中的藉由碳酸氣體的還原狀態且藉由螯合效果捕捉色素而長時間使多酚及肌紅蛋白氧化者,其係將(1)乙酸、抗壞血酸、檸檬酸、酒石酸等有機酸或其鹼金屬或鹼土類金屬鹽、(2)鹼金屬或鹼土類碳酸鹽、(3)明礬作為有效成分之水溶性組成物,該碳酸氣體發泡性鹼組成物或水溶液的特徵為,在有機酸或其鹽的水溶液中分解鹼金屬或鹼土類金屬碳酸鹽,在弱鹼性(pH8左右)區域使碳酸氣體發泡。
