"4 years in the works ...Black MZ is based on Ascorbic acid, eliminates corrosive sulfur altogether and has additives to tame the hygroscopic agents still in mix...testing at 70* 95% humidity for 14days found only a gain of 2% water weight, while the competition gained up to 25%...lower ignition temps...easy use with #11 caps..use right in pan for flinters....only a slight hint of crud ring after 7 shots... velocities very close to BH-777." I only gave short snips of article.