It's all to perfect and then to commercialize a fine black powder ... up enough powder annually for 6 million amp-hours' worth of batteries. That would be enough black magic for 2.3 million ...

Most sales-gas pipeline operators experience black powder. 1-6 It occurs in several forms, including a wet tar-like substance (Fig. 1) or a dry, fine powder (Fig. 2). Black powder occurs in both ...