Chlorophyllin refers to any one of a group of closely related water-soluble salts that are semi-synthetic derivatives of chlorophyll, differing in the identity of the cations associated with the anion. Its most common form is a sodium/copper derivative used as a food additive and in alternative medicine. Chlorophyll is present in green leafy vegetables and reaching levels as high as 5.7% in spinach. Because chlorophyll does not dissolve in water, food sources of chlorophyll do not bind to mutagenic substances to a significant extent. Chlorophyllin is the active ingredient in a number of internally taken preparations intended to reduce odors associated with incontinence, colostomies and similar procedures, as well as body odor in general. It is also available as a topical preparation, purportedly useful for both treatment and odor control of wounds, injuries, and other skin conditions - notably radiation burns.