Commercial Airfloat Charcoal is acceptable. No ballmilling required. All chemicals able to pass 40-mesh screen. Screen-mix chemicals. Add approximately 20% 9/1 water/denatured-alcohol, to make nice putty ball. Screen-granulate through 16-mesh screen (window screen), onto non-absorbant surface. Allow to dry until not sticky. Screen-granulate again. Allow to completely dry.