Clean Fawn and Sooty Fawn

According to the Angora color guide in the ARBA Standard of Perfection (SOP),  fawn is described as:
"Dorsal wool is to be a clear golden color.  Fawns are to have white eye circles, inside of ears, nostrils, underside of jowls, belly and underside of tail.  White undercolor is allowed and they may have lap spots. Eyes - Brown.
Faults: Any smut, ticking, ear lacking or faint grayish band in wool. 

Some of the fawn Angora is very clean in the face while some has black tips, breeders would refer such as "Clean Fawn" and "Sooty Fawn". 

The description in the SOP is for the "Clean Fawn" while the "Sooty Fawn" is considered a fault.

In tort, the black based tort is considered as "black tort" or "regular tort", the darker the points the better.  The genetic make-up is aaB-C-D-ee.

 The chocolate based tort is called "chocolate tort", the points are golden and the wool is clean and also golden.   The genetic make-up is aabbC-D-ee. 

The genetic coding for fawn is A---C-D-ee   

Unfortunately in fawn, there is no distinction in the SOP concerning whether the fawn is black based or chocolate based, as a result the black based fawn is given the status of being a fault.   (There are only 5 points assigned to color, the deduction should be at minimum).

Black based fawn is A-B-C-D-ee
Chocolate based fawn is A-bbC-D-ee

As you can see the only difference between the torts and fawns is that tort is a self while fawn is an agouti.  The rest are the same.

The two side-by-side photos shows the chocolate based fawn on the left and the black based fawn on the right.   Can you tell the difference?


 

Here are the profile comparison of chocolate based fawn and black based fawn.   The chocolate based fawn has a clean face and brownish ears and the body color is very bright.  The black based fawn has black tips on the face and ears are grayish, the wool color is somewhat subtle comparing to the chocolate based fawn.

These two bunnies are littermates.  It is known that the mother is a chocolate based fawn with the following color genes:  AabbCCDdee

 and the father is a regular tort who carries both the black gene and the chocolate gene:
aaBbCcD-ee

The clean fawn bunny on the left is
AabbC-D-ee

The sooty fawn bunny on the right is
AaBbC-D-ee