What colors do Norwich Terriers come in?

What colors do Norwich Terriers come in?
Norwich Terriers, according to American Kennel Club standards, come in four accepted colors: red, wheaten, black and tan, and grizzle (which includes various shades of tan and red with black hairs interspersed, creating a “pepper and salt” appearance).
Deviation from these colors can be considered a fault in the breed standard. For instance, colors such as solid black, solid white, or blue (a diluted black) are generally considered deviations and may not meet the breed standard for showing purposes. White markings are discouraged. Additionally, any colors or markings that obscure the Norwich Terrier’s characteristic facial expression are considered faults. 
Of course, deviations from the accepted coat color and markings don’t affect the Norwich Terrier’s health or devalue them as an individual or canine companion. Ultimately, what matters most in the relationship between a dog and their person is the bond they share and the mutual love and companionship they provide to each other, regardless of appearance.