This is no longer a good practice, for true Albinos are now being produced through multiple mutations. The Cinnamon was the second sex-linked recessive mutation. Here the grey of the normal is turned to a deep brown. This melanin color is extremely variable. Cinnamon cockatiels have various shades of brown.
Cocks are most often darker than the hens.
The term Isabelle is sometimes used in connection with this color. The cockatiel color is not similar to the Isabelle found in either the canary or the domestic pigeon. It is almost always preferable to use the same name if an analogous color occurs in the budgerigar. With this in mind, it is better to use Cinnamon. The color of this variety is very similar to the lacing seen in the Oriental Frill breed of domestic pigeon.