In cold weather you may see some color on the tail, nose or ears. Ermines sometimes have very light gray eyes and people mistake them for blue eyed whites. They are no where close to the crystal blue of the BEW.
Chestnut Agouti + the non extension gene= Fawn so that translates into Chinchilla Agouti + the non extension gene = Ermine Their also called Frosted Pearl and Frosties.