#613a is a sun bleached blonde color - above is a photo from our Femme vs Faux page that shows how different different 613a's can look from different wig lines (just pretend the green streaks aren't there =)).

Generally the #613a in the Classic Collections run a little more like the wig shown on the left in the photo above. They're very pale. Usually the #613a in the New Look collection look more like the wig on the right, which has more of a yellow tinge to the fiber. There is almost always at least a slight difference in blondes from different factories, this difference is a little more dramatic than in other blondes, so I want to make sure you're aware of it.