Abstract: Skin disinfectant with colorizer, plus removal of the resulting color, especially for udders of milking animals. An aqueous solution of a permanganate as colorizer, a hypochlorite as disinfectant, and an organic acid as buffer is applied in a post-milking step. The resulting color provides positive visual assurance of disinfectant application. Subsequent removal of the color can be accomplished by applyication of an aqueous solution of peroxide and an organic acid. Removal of residual color is appropriate just before the next milking not only as a cleaning step but also to ensure post-milking disinfecting, and is also effective upon the hands or other skin of persons or animals however colored with permanganate or like material.

Abstract: Post-milking udder care to assure udder disinfection, including coloring the udder with an iodine-free inorganic composition as an indicator of such treatment, including especially applying to the udder of a milking animal an aqueous solution of an alkali metal hypochlorite containing an alkali metal permanganate in such concentration as to be visible for at least a substantial period of time thereafter, if not up until the time of the next milking. Preferred compositions include several percent of sodium hypochlorite, with enough potassium permangananate to be visible for such a period of time on an udder to which it is applied.

Abstract: Post-milking and pre-milking udder care to assure udder disinfection, including coloring the udder after milking and decolorizing the udder before milking. The post-milking step includes applying thereto an aqueous solution of an alkali metal hypochlorite and an alkali metal permanganate, whereas the pre-milking step includes applying thereto an aqueous solution of a peroxide and an organic acid. Preferred component compositions include sodium hypochlorite, potassium permanganate, hydrogen peroxide, and acetic acid.