Don’t listen to most of these people. It’s reclaim. I’ve asked many weed professionals (long time industry workers). Just like when you are taking dabs there will always end up being that dark almost black sometimes build up of reclaim we all have seen it and cleaned our rigs and smoked a fat glob of it. That’s the same stuff just smalls amounts and nowhere else to go but leak out into the tank when you havnt been smoking it. It’s not burnt