How can you tell a Seal from a Black?

[HappyFarmBunnies]

All the genetic calculators are saying that seals will show up often in my litters as well as blacks, so I am wondering if anyone has any tips as to how to tell a seal from a black in the nest--at birth, at 2 weeks, and at 6 weeks if possible. I have seen pictures but it seems impossible to tell....

Thank you!!

 

[hillrise]

http://www.rexrabbitsusa.com/identifyingcolors.htm

This compares rex sables and blacks, so it's a little different because of their fur length, but it will give you an idea.

 

[pamnock]

I look at the bellies for some evidence of a lighter shade.

 

[mistyjr]

That helps me too.
I have a lionhead that alot people said she might be a seal and some others said different!