PROBLEM TO BE SOLVED: To provide bath agents substantially containing no bicarbonate ion, the bath agents being able to provide a smooth feel and the retentivity of warm effect in the skin surface of the face by enhancing face washing effect with warm water by increasing the concentration of bicarbonate ion in water after dissolving in warm bath water a solid bath agent containing bicarbonate.SOLUTION: The present invention relates to a solid bath agent containing bicarbonate (sodium bicarbonate or potassium bicarbonate) and organic acid, in which the PH of an aqueous solution immediately after dissolving the solid bath agent is 5.5 to 9.0, any bicarbonate ion blocking agent is not contained, the organic acid is at least one of citric acid, fumaric acid, succinic acid, and malic acid, and anhydrous sodium carbonate and/or anhydrous potassium carbonate is contained and to a face washing esthetic method using warm water in which the solid bath agent is dissolved.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】重炭酸塩を含有する固形浴剤において、浴湯に溶解した後の水中の重炭酸イオンを高濃度にすることで、湯水による洗顔エステ効果を高め、顔の皮膚表面のすべすべ感及び温まり効果の持続性を得ることができる、実質的に重炭酸イオン封鎖物質を含有しない浴剤の提供。【解決手段】重炭酸塩(炭酸水素ナトリウム又は炭酸水素カリウム)と有機酸を含有する固形浴剤において、固形浴剤を溶解した直後の水溶液のPHが5.5から9.0であり、重炭酸イオン封鎖物質を含有しない固形浴剤であって、前記有機酸がクエン酸、フマル酸、コハク酸、リンゴ酸の少なくとも1つであり、かつ無水炭酸ナトリウム及び/又は無水炭酸カリウムを含有する固形浴剤、並びに前記固形浴剤を溶解させた湯水を用いる洗顔エステ方法。【選択図】なし
