I don't know much about that specific type, but I do know about plain castor oil!
Castor oil itself leaves shine to the hair, and it also contains a certain ingredient that promotes hair growth. If used for a while, compared to people who don't use castor oil, they noticed a significant difference in the thickness of their hair. Hey, let's face it, all hair's love oil! It's what they naturally produce, is it not?
Sorry that I don't know fudge about black castor oil, but this might help. Also, if your interested in growing hair in general I recommend taking Hair vitamins, they sell them at drug stores. They contain nutrients for healthy hair growth!
Hope I helped!