What is this marking?

[Tbgb1912]

My doe has begun to darken around her face, with a dirty/smutty colouring.

Sorry the pictures make it hard to tell, but you can kinda make out the dirtier facial markings, along with on her ears too.

 

[akane]

I don't see enough of any color in the photos to think she is anything but a smutty orange (or fawn or red depending on what color name is used for what breed).

 

[Zass]

I second that. The smut just looks like normal smut.

 

[Dood]

Normal smut - it is not desirable for fawns / orange /red coloured rabbits on the show table so most people only use rabbits without it as breeding stock

She is also moulting and it looks like her new fur will be darker with more ticking than her baby coat and in time all of her fur will look this way

You are correct that the non extension gene that turns chestnuts into fawns, blacks into torts and sables into seal points, like the bunny in the picture, is at work in your fawn rabbit but the sable /light shaded gene creates more of a "pointed" look just on its own (as seen in Siamese sables) and is not responsible for your bunnies smutty nose

 

[Tbgb1912]

Normal smut - it is not desirable for fawns / orange /red coloured rabbits on the show table so most people only use rabbits without it as breeding stock

She is also moulting and it looks like her new fur will be darker with more ticking than her baby coat and in time all of her fur will look this way

You are correct that the non extension gene that turns chestnuts into fawns, blacks into torts and sables into seal points, like the bunny in the picture, is at work in your fawn rabbit but the sable /light shaded gene creates more of a "pointed" look just on its own (as seen in Siamese sables) and is not responsible for your bunnies smutty nose

Okay thanks for that!