Opposites of the Blacks, the Reds genetic factors block out all the black in them. This is caused by a recessive gene, in this case, the gene for the reddish color, that has become dominant. well.

They're Really Rare!
There are ONLY 28 solid Reds In Existence!! A Red will reproduce Red pups, even when bred with an Airedale with "normal" coloring. Here is Jolly, a 5th Generation Red, ready to be bred this Late Spring (2003)