... acid,dye grade,food geade,beer-mashing grade,beer brewing grade Physicochemical Properties:It is faint yellow or brown non-stereotypia powder ... Technical index:Appearance:Faint yellow or brown non-stereotypia powder Content¡Ý81.0% Water¡Ü9.0% Water ... material of preparing medical gallic acid, burnt gallic acid, sulfonamides. Preparing Gallic acid and burnt Gallic acid in chemical production, mud ...