I started following bob parks edge process. When I went to dye, I got a lot of streaking in the edge area. I was thinking it was the saddle soap that was keeping the dye from penetrating as well. Then I did it with just water for burnishing and the wet area created a darker halo when I dyed. 
I am using the deglazer, neatsfoot oil, then dying. 
I also noticed with the yellow saddle soap it stains English bridle, it gave me these permanent dark spots. 
Thanks for any help