there is no such thing as a blue nose pit bull bloodline. blue is a dilute of black. it is the dilution gene acting on the black color. you can get that color in any line by breeding those with the dilution gene. watch for skin issues, allergies, and with blue eyes you have to watch for deafness. try not to breed for just color as there are many other things to take into account. temperament first and foremost. this breed is already in a bad light.