I agree with an earlier post where someone stated that heroin should not and usually doesn't EVER give a pins & needles effect. Morphine, however, does. That is the #1 reason I HATE morphine. But, if you are buying this so called heroin, and it has the brown/black look to it, smell it. Does it have a vinegar scent to it? Or does it smell like burnt cookies or molasses? I'm guessing regardless of the smell, you're injecting OPIUM, not heroin. Look it up on Wikipedia. It comes from the opium bulb and my little Asian friend brought some too me one day, his mother made it from scratch. Anyway, a friend assumed it would be just like heroin and boy did she get a surprise! She said it felt like she did 10 morphine 100's and it was so painful. I took a different approach. I used WAY less then she did, added a little bit more water, made it up and got a totally different result. Mine was that of my favorite drug, dilaudid. That's what it felt like for me. So try that. Use less, use more water, and you'll probably get that feeling one gets from hydromorphone.
Hope this helped.