Potassium permanganate is currently unapproved, but is in
a special category—regulatory action is deferred pending
further study. Acriflavine neutral, methylene blue, and
nitrofurazone are not approved and are of high enforcement
priority if used illegally in foodfish, and use is subject
to regulatory action on a case-by-case basis. Malachite
green used in Quick Cure is also a high enforcement
priority chemical if used illegally in foodfish.