When the word "mustard" comes to mind, it generally evokes images of Coney dogs and German sausages drenched in various shades of yellow. But what about envisioning mustard as a part of hydrotherapy used in bathing? Using mustard as a form of relaxation and detoxification may seem far-fetched, but it’s a method dating back to the ancient Greeks and Romans. Mustard baths are also colored throughout England’s history and continue to rise in popularity.