Harvested a bunch of spruce and hemlock pitch globs on Sunday......... start by putting them all into a stainless pot or bowl and put them on the stove on MED heat. Its going to take awhile to heat up and melt and for all the impurities (bark, sand, bugs) etc to settle to the bottom) stir often, and KEEP AN EYE ON IT.......for safety sakes (FIRE). I actually had to up the temps to MED-HIGH for this batch....its some of the thickest and strongest pitch i have melted ever. Once melted, simmer it for about 20 minutes, stir often and then let it sit on the heat for a bit so all the impurities settle.. then .......SLOWLY and carefully POUR OFF the liquid, leaving the bark and residues behind. (they make excellent firestarters! KEEP THEM! pure pitch the next stage is grind up charcoal and dried rabbit droppings or deer dropping......think of the grass fibers in the droppings as "short strand fiberglass strands" - adds STRENGTH to the pitch glue. This will be ongoing when i have time and resources. stay tuned.