Blue and Opal Color Development

The very left of the bunny is a blue, the ears have solid color just like the rest of its body.   

The bunny on the very right is an opal.   Opal is a name for blue agouti, same color genes as the blue except it's the agouti version.

Blue aaB-C-ddE-

Opal A-B-C-ddE-

The two bunnies are side by side to compare.

At two weeks old, the opal shows tan/beige undercoat, not as crispy blue as the self blue.

At 8 weeks old with the wool growing out, the agouti influence on the blue is more evident comparing to the self blue.

The same two bunnies view from the back, self blue on the left and the opal on the right.