Blues are special because og the genetics that have to be right ot make a blue.
Only Fawns and Blues have the genetics "Defect" that makes a true blue pitbull.
whats the "defcet"? a true bluse dog is not able to produce black pigment.
If a dog has plack pigment, nose eyelids, anything it dog is grey not blue.
So IMOP what you did by selling unregitered dogs to any and everyone does the breed just as much harm as the attack stories and myths.
I won't recognize a dog without registration papers because you have no idea what that dog truley is. it can look like a American Pit Bull Terrier (APBT) and have Chow Chow in the blood line. I am sure in your day you have seen one dog out of the litter that looks like it is from another dog all together. inbreeding and "backyard"breeding have produced more unstalbe and ill willed dogs than ever. that bring about bad owners and horror stories and myths and the public apion that this breed is bad.

you are correct on the American Staffordshire Terrier being the beging of the blue gene, but the AMStaff is in its origins the same dog as the American Pit bull terrier. Same history, same blood, but differnt in two ways, one: The AKC will only recongnize the American Starforshire Terrier and not any dog with a differnt registered name, THe UKC will recongize both that AMstaff and APBT and resister them both as APBT, the ADBA is a APBT only residtry and the most common amung breeders. Two: the AKC AMStaff was selectivle breed for Show dogs. having "the look" to win at shows. while the APBT was breed for it's true qualities as a terrier, gameness being one of them and by all means have more "will do heart" than their counterpart

more to come....