Bright black powder with less than 2% of semitransparent and/or whitish crystals SIZES (US mesh - stock items): 60/80, 80/100, 100/120, 120/140, 140/170, 170/200, 200/230, 230/270, 270/325, 325/400, 400/500SIZES (microns - stock items): 2-4, 4-8, 8-12, 10-14, 14-20, 15-25, 20-30, 22-36, 20-40, 30-40, 40-60Other micron sizes available on requestReactivity test :2000-2800 times Mechanical ...