Answers (1)
Wash it again immediately by itself and hopefully the colour comes out.
If not try this:
Soak it in the bathroom sink (or bathtub) filled with hot water and dissolve 1/2 cup of Tide, 1/2 cup of Borax detergent booster, a big splash of rubbing alcohol, a big splash of white vinegar, and small splash of regular Clorox bleach.
Good luck, hope it works. :0)
only the collar though, not the blue coat. (Hopefully it's removable). If not I would bring the coat to dry cleaners and let them deal with it.