We are offering black iron oxide. Technical specifications total iron (fe2o3) content % 91-93 ph value 6-7 oil absorption (g100g) 19-21 volatile matter (% by mass) 0.75-1.0 density (gcm3) 0.5-0.65 residue on 400 mesh sieve (% by mass) 0.1-0.3 water soluble (% by mass) 1.0-1.25 loss on igition (1000'c) 1.0-1.5 particle shape acicular tinting strength vs standard % 95-105.