"When I put the flame inside the bowl black smoke came out. Is this normal or is it the result of a chemical that was sprayed onto the bowl? "
First of all clean your pipe with hot water, vinegar, and hand soap. I’m more than sure you have a lot of resin..this sticky good stuff when smoked with your fresh pot in your clean blow will get you real high so stay home when smoking this mixer, try to remove it first,before cleaning your pipe wear some rubber gloves to avoid cutting yourself if the glass pipe break in your hands… one more note this resin will smell very strong due to the facts that this substance has been setting there soaking up for weeks. I change my screens before smoking and it still collect at the bottom. Enjoy your tokes. 😀