My transplanted hair shedding with black bulb. Is that normal?

It is normal to lose transplanted hairs weeks after surgery.  It may take 6 to 12 months to see new hairs grow out.  It is not clear what is the significance of the color of your "bulbs".  If you are concerned, contact your doctor for a follow up exam.

That is normal and transplanted graft’s hair starts to shedding in the first week of surgery and may go on untill 4-6 th weeks after surgery. İt is not surprising to lost approx.  %70-80 of all transplanted hair shafts in first month when you are washing, gently rubbing  or touching the head. İt is shock loss and not permanent. Even your native hair may affected with that post traumatic transient hair loss…New hair at transplant and donor area starts to grow at 3-4 th month after surgery .

These hairs will sooner or later shed. They are never a problem for new hairs that start to grow. Usually, there is a lag time between the time the hairs shed (2-8 weeks) and the time the new hair grows (3-8 months). IF for any reason, there is an overlap between the two, pay no attention to it for when the new hair grows, the old hairs from the grafts that may persist beyond 8 weeks, will eventually shed