To provide a black toner having excellent charging property and transferring property against a severe environmental change. The black toner includes toner particle containing at least a binder resin, carbon black and a releasing agent, wherein: the toner particles have a weight-average particle diameter...http://www.google.com.au/patents/US7300733?utm_source=gb-gplus-sharePatent US7300733 - Black toner with defined loss tangent
