SWIM bought 1 lb of rootbark by accident and it sucks. Grind it up to a fine powder and still had a shitload of fibers that are worthless in dye making. Conversion rate, well that sucked big time, with MHRB powder SWIM gets 1.7g more than the rootbark. Powder is the best, and only cost 3.00 more a lb. SWIM was pissed for not paying attention when she ordered her dye supplies. Never again. No more rootbark. There is no loss in MHRB powder due to oxidation. BS She get a 1.7% conversion rate constantly of nice clear shards, under slow non polar solvent evap. Oh yeah, JFYI there is no fat in MHRB or powder, the yellow is tannins and tannins are not fats. HCL concentrates when reduced and does not evap, vinegar will disappear but only after repeated reductions of added water.