u/CompetitionFew3164

So I recently got my first device to smoke wax out of. The first two products I used were from the dispensary and after the 2nd round with a little over a grain sized dab it was dark black. Now this week I bought some wax off the street, I ran it for 3 rounds before it was done and the wax was still "clear" when I cleaned out my device.. why is it that legal product left behind such a dark residue, as not the street sourced?